diff --git a/.github/scripts/compute-fbank-librispeech-test-clean-and-test-other.sh b/.github/scripts/compute-fbank-librispeech-test-clean-and-test-other.sh
index a4a6cd8d7..bb7c7dfdc 100755
--- a/.github/scripts/compute-fbank-librispeech-test-clean-and-test-other.sh
+++ b/.github/scripts/compute-fbank-librispeech-test-clean-and-test-other.sh
@@ -4,6 +4,8 @@
 # The computed features are saved to ~/tmp/fbank-libri and are
 # cached for later runs
 
+set -e
+
 export PYTHONPATH=$PWD:$PYTHONPATH
 echo $PYTHONPATH
 
diff --git a/.github/scripts/download-gigaspeech-dev-test-dataset.sh b/.github/scripts/download-gigaspeech-dev-test-dataset.sh
index b9464de9f..f3564efc7 100755
--- a/.github/scripts/download-gigaspeech-dev-test-dataset.sh
+++ b/.github/scripts/download-gigaspeech-dev-test-dataset.sh
@@ -6,6 +6,8 @@
 # You will find directories `~/tmp/giga-dev-dataset-fbank` after running
 # this script.
 
+set -e
+
 mkdir -p ~/tmp
 cd ~/tmp
 
diff --git a/.github/scripts/download-librispeech-test-clean-and-test-other-dataset.sh b/.github/scripts/download-librispeech-test-clean-and-test-other-dataset.sh
index 3efcc13e3..11704526c 100755
--- a/.github/scripts/download-librispeech-test-clean-and-test-other-dataset.sh
+++ b/.github/scripts/download-librispeech-test-clean-and-test-other-dataset.sh
@@ -7,6 +7,8 @@
 # You will find directories ~/tmp/download/LibriSpeech after running
 # this script.
 
+set -e
+
 mkdir ~/tmp/download
 cd egs/librispeech/ASR
 ln -s ~/tmp/download .
diff --git a/.github/scripts/install-kaldifeat.sh b/.github/scripts/install-kaldifeat.sh
index 6666a5064..de30f7dfe 100755
--- a/.github/scripts/install-kaldifeat.sh
+++ b/.github/scripts/install-kaldifeat.sh
@@ -3,6 +3,8 @@
 # This script installs kaldifeat into the directory ~/tmp/kaldifeat
 # which is cached by GitHub actions for later runs.
 
+set -e
+
 mkdir -p ~/tmp
 cd ~/tmp
 git clone https://github.com/csukuangfj/kaldifeat
diff --git a/.github/scripts/prepare-librispeech-test-clean-and-test-other-manifests.sh b/.github/scripts/prepare-librispeech-test-clean-and-test-other-manifests.sh
index e0b87e0fc..1b48aae27 100755
--- a/.github/scripts/prepare-librispeech-test-clean-and-test-other-manifests.sh
+++ b/.github/scripts/prepare-librispeech-test-clean-and-test-other-manifests.sh
@@ -4,6 +4,8 @@
 # to egs/librispeech/ASR/download/LibriSpeech and generates manifest
 # files in egs/librispeech/ASR/data/manifests
 
+set -e
+
 cd egs/librispeech/ASR
 [ ! -e download ] && ln -s ~/tmp/download .
 mkdir -p data/manifests
diff --git a/.github/scripts/run-aishell-pruned-transducer-stateless3-2022-06-20.sh b/.github/scripts/run-aishell-pruned-transducer-stateless3-2022-06-20.sh
index 631707ad9..aab2883a9 100755
--- a/.github/scripts/run-aishell-pruned-transducer-stateless3-2022-06-20.sh
+++ b/.github/scripts/run-aishell-pruned-transducer-stateless3-2022-06-20.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-gigaspeech-pruned-transducer-stateless2-2022-05-12.sh b/.github/scripts/run-gigaspeech-pruned-transducer-stateless2-2022-05-12.sh
index 528d04cd1..c8d9c6b77 100755
--- a/.github/scripts/run-gigaspeech-pruned-transducer-stateless2-2022-05-12.sh
+++ b/.github/scripts/run-gigaspeech-pruned-transducer-stateless2-2022-05-12.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-lstm-transducer-stateless2-2022-09-03.yml b/.github/scripts/run-librispeech-lstm-transducer-stateless2-2022-09-03.yml
index 19d606682..3d57a895c 100755
--- a/.github/scripts/run-librispeech-lstm-transducer-stateless2-2022-09-03.yml
+++ b/.github/scripts/run-librispeech-lstm-transducer-stateless2-2022-09-03.yml
@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+#
+set -e
 
 log() {
   # This function is from espnet
diff --git a/.github/scripts/run-librispeech-pruned-transducer-stateless-2022-03-12.sh b/.github/scripts/run-librispeech-pruned-transducer-stateless-2022-03-12.sh
index bd816c2d6..dafea56db 100755
--- a/.github/scripts/run-librispeech-pruned-transducer-stateless-2022-03-12.sh
+++ b/.github/scripts/run-librispeech-pruned-transducer-stateless-2022-03-12.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-pruned-transducer-stateless2-2022-04-29.sh b/.github/scripts/run-librispeech-pruned-transducer-stateless2-2022-04-29.sh
index 6b5b51bd7..d1e4a3991 100755
--- a/.github/scripts/run-librispeech-pruned-transducer-stateless2-2022-04-29.sh
+++ b/.github/scripts/run-librispeech-pruned-transducer-stateless2-2022-04-29.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-04-29.sh b/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-04-29.sh
index 62ea02c47..172d7ad4c 100755
--- a/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-04-29.sh
+++ b/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-04-29.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-05-13.sh b/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-05-13.sh
index 34dbdf44d..880767443 100755
--- a/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-05-13.sh
+++ b/.github/scripts/run-librispeech-pruned-transducer-stateless3-2022-05-13.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
@@ -62,15 +64,13 @@ log "Decode with ONNX models"
   --onnx-joiner-encoder-proj-filename $repo/exp/joiner_encoder_proj.onnx \
   --onnx-joiner-decoder-proj-filename $repo/exp/joiner_decoder_proj.onnx
 
-./pruned_transducer_stateless3/onnx_check_all_in_one.py \
-  --jit-filename $repo/exp/cpu_jit.pt \
-  --onnx-all-in-one-filename $repo/exp/all_in_one.onnx
-
 ./pruned_transducer_stateless3/onnx_pretrained.py \
   --bpe-model $repo/data/lang_bpe_500/bpe.model \
   --encoder-model-filename $repo/exp/encoder.onnx \
   --decoder-model-filename $repo/exp/decoder.onnx \
   --joiner-model-filename $repo/exp/joiner.onnx \
+  --joiner-encoder-proj-model-filename $repo/exp/joiner_encoder_proj.onnx \
+  --joiner-decoder-proj-model-filename $repo/exp/joiner_decoder_proj.onnx \
   $repo/test_wavs/1089-134686-0001.wav \
   $repo/test_wavs/1221-135766-0001.wav \
   $repo/test_wavs/1221-135766-0002.wav
diff --git a/.github/scripts/run-librispeech-pruned-transducer-stateless5-2022-05-13.sh b/.github/scripts/run-librispeech-pruned-transducer-stateless5-2022-05-13.sh
index c893bc45a..c6a781318 100755
--- a/.github/scripts/run-librispeech-pruned-transducer-stateless5-2022-05-13.sh
+++ b/.github/scripts/run-librispeech-pruned-transducer-stateless5-2022-05-13.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-streaming-pruned-transducer-stateless2-2022-06-26.sh b/.github/scripts/run-librispeech-streaming-pruned-transducer-stateless2-2022-06-26.sh
index d9dc34e48..af37102d5 100755
--- a/.github/scripts/run-librispeech-streaming-pruned-transducer-stateless2-2022-06-26.sh
+++ b/.github/scripts/run-librispeech-streaming-pruned-transducer-stateless2-2022-06-26.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-librispeech-transducer-stateless2-2022-04-19.sh b/.github/scripts/run-librispeech-transducer-stateless2-2022-04-19.sh
index c22660d0a..5b8ed396b 100755
--- a/.github/scripts/run-librispeech-transducer-stateless2-2022-04-19.sh
+++ b/.github/scripts/run-librispeech-transducer-stateless2-2022-04-19.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-conformer-ctc.sh b/.github/scripts/run-pre-trained-conformer-ctc.sh
index 96a072c46..6368b0bbd 100755
--- a/.github/scripts/run-pre-trained-conformer-ctc.sh
+++ b/.github/scripts/run-pre-trained-conformer-ctc.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer-stateless-librispeech-100h.sh b/.github/scripts/run-pre-trained-transducer-stateless-librispeech-100h.sh
index dcc99d62e..209d4814f 100755
--- a/.github/scripts/run-pre-trained-transducer-stateless-librispeech-100h.sh
+++ b/.github/scripts/run-pre-trained-transducer-stateless-librispeech-100h.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer-stateless-librispeech-960h.sh b/.github/scripts/run-pre-trained-transducer-stateless-librispeech-960h.sh
index 9622224c9..34ff76fe4 100755
--- a/.github/scripts/run-pre-trained-transducer-stateless-librispeech-960h.sh
+++ b/.github/scripts/run-pre-trained-transducer-stateless-librispeech-960h.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer-stateless-modified-2-aishell.sh b/.github/scripts/run-pre-trained-transducer-stateless-modified-2-aishell.sh
index 168aee766..75650c2d3 100755
--- a/.github/scripts/run-pre-trained-transducer-stateless-modified-2-aishell.sh
+++ b/.github/scripts/run-pre-trained-transducer-stateless-modified-2-aishell.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer-stateless-modified-aishell.sh b/.github/scripts/run-pre-trained-transducer-stateless-modified-aishell.sh
index 9211b22eb..bcc2d74cb 100755
--- a/.github/scripts/run-pre-trained-transducer-stateless-modified-aishell.sh
+++ b/.github/scripts/run-pre-trained-transducer-stateless-modified-aishell.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer-stateless.sh b/.github/scripts/run-pre-trained-transducer-stateless.sh
index 4a1dc1a7e..d3e40315a 100755
--- a/.github/scripts/run-pre-trained-transducer-stateless.sh
+++ b/.github/scripts/run-pre-trained-transducer-stateless.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/.github/scripts/run-pre-trained-transducer.sh b/.github/scripts/run-pre-trained-transducer.sh
index 5f8a5b3a5..cfa006776 100755
--- a/.github/scripts/run-pre-trained-transducer.sh
+++ b/.github/scripts/run-pre-trained-transducer.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
 
+set -e
+
 log() {
   # This function is from espnet
   local fname=${BASH_SOURCE[1]##*/}
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless2/conformer.py b/egs/librispeech/ASR/pruned_transducer_stateless2/conformer.py
index c10678549..bce8a6bd1 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless2/conformer.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless2/conformer.py
@@ -476,8 +476,8 @@ class ConformerEncoderLayer(nn.Module):
         self,
         src: Tensor,
         pos_emb: Tensor,
-        src_mask: Optional[Tensor] = None,
         src_key_padding_mask: Optional[Tensor] = None,
+        src_mask: Optional[Tensor] = None,
         warmup: float = 1.0,
     ) -> Tensor:
         """
@@ -486,8 +486,8 @@ class ConformerEncoderLayer(nn.Module):
         Args:
             src: the sequence to the encoder layer (required).
             pos_emb: Positional embedding tensor (required).
-            src_mask: the mask for the src sequence (optional).
             src_key_padding_mask: the mask for the src keys per batch (optional).
+            src_mask: the mask for the src sequence (optional).
             warmup: controls selective bypass of of layers; if < 1.0, we will
               bypass layers more frequently.
         Shape:
@@ -663,8 +663,8 @@ class ConformerEncoder(nn.Module):
         self,
         src: Tensor,
         pos_emb: Tensor,
-        mask: Optional[Tensor] = None,
         src_key_padding_mask: Optional[Tensor] = None,
+        mask: Optional[Tensor] = None,
         warmup: float = 1.0,
     ) -> Tensor:
         r"""Pass the input through the encoder layers in turn.
@@ -672,8 +672,8 @@ class ConformerEncoder(nn.Module):
         Args:
             src: the sequence to the encoder (required).
             pos_emb: Positional embedding tensor (required).
-            mask: the mask for the src sequence (optional).
             src_key_padding_mask: the mask for the src keys per batch (optional).
+            mask: the mask for the src sequence (optional).
             warmup: controls selective bypass of of layers; if < 1.0, we will
               bypass layers more frequently.
 
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/export.py b/egs/librispeech/ASR/pruned_transducer_stateless3/export.py
index 11f24244e..36c8d6611 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/export.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/export.py
@@ -62,7 +62,7 @@ It will generates 3 files: `encoder_jit_trace.pt`,
   --avg 10 \
   --onnx 1
 
-It will generate the following six files in the given `exp_dir`.
+It will generate the following files in the given `exp_dir`.
 Check `onnx_check.py` for how to use them.
 
     - encoder.onnx
@@ -70,8 +70,8 @@ Check `onnx_check.py` for how to use them.
     - joiner.onnx
     - joiner_encoder_proj.onnx
     - joiner_decoder_proj.onnx
-    - all_in_one.onnx
 
+Please see ./onnx_pretrained.py for usage of the generated files
 
 (4) Export `model.state_dict()`
 
@@ -118,8 +118,6 @@ import argparse
 import logging
 from pathlib import Path
 
-import onnx_graphsurgeon as gs
-import onnx
 import sentencepiece as spm
 import torch
 import torch.nn as nn
@@ -217,16 +215,15 @@ def get_parser():
         type=str2bool,
         default=False,
         help="""If True, --jit is ignored and it exports the model
-        to onnx format. Three files will be generated:
+        to onnx format. It will generate the following files:
 
             - encoder.onnx
             - decoder.onnx
             - joiner.onnx
             - joiner_encoder_proj.onnx
             - joiner_decoder_proj.onnx
-            - all_in_one.onnx
 
-        Check ./onnx_check.py and ./onnx_pretrained.py for how to use them.
+        Refer to ./onnx_check.py and ./onnx_pretrained.py for how to use them.
         """,
     )
 
@@ -483,134 +480,99 @@ def export_joiner_model_onnx(
     opset_version: int = 11,
 ) -> None:
     """Export the joiner model to ONNX format.
-    The exported model has two inputs:
+    The exported joiner model has two inputs:
+
+        - projected_encoder_out: a tensor of shape (N, joiner_dim)
+        - projected_decoder_out: a tensor of shape (N, joiner_dim)
+
+    and produces one output:
+
+        - logit: a tensor of shape (N, vocab_size)
+
+    The exported encoder_proj model has one input:
 
         - encoder_out: a tensor of shape (N, encoder_out_dim)
+
+    and produces one output:
+
+        - projected_encoder_out: a tensor of shape (N, joiner_dim)
+
+    The exported decoder_proj model has one input:
+
         - decoder_out: a tensor of shape (N, decoder_out_dim)
 
-    and has one output:
-
-        - joiner_out: a tensor of shape (N, vocab_size)
+    and produces one output:
 
+        - projected_decoder_out: a tensor of shape (N, joiner_dim)
     """
+    encoder_proj_filename = str(joiner_filename).replace(
+        ".onnx", "_encoder_proj.onnx"
+    )
+
+    decoder_proj_filename = str(joiner_filename).replace(
+        ".onnx", "_decoder_proj.onnx"
+    )
+
     encoder_out_dim = joiner_model.encoder_proj.weight.shape[1]
     decoder_out_dim = joiner_model.decoder_proj.weight.shape[1]
-    encoder_out = torch.rand(1, 1, 1, encoder_out_dim, dtype=torch.float32)
-    decoder_out = torch.rand(1, 1, 1, decoder_out_dim, dtype=torch.float32)
+    joiner_dim = joiner_model.decoder_proj.weight.shape[0]
 
-    project_input = True
+    projected_encoder_out = torch.rand(1, joiner_dim, dtype=torch.float32)
+    projected_decoder_out = torch.rand(1, joiner_dim, dtype=torch.float32)
+
+    project_input = False
     # Note: It uses torch.jit.trace() internally
     torch.onnx.export(
         joiner_model,
-        (encoder_out, decoder_out, project_input),
+        (projected_encoder_out, projected_decoder_out, project_input),
         joiner_filename,
         verbose=False,
         opset_version=opset_version,
-        input_names=["encoder_out", "decoder_out", "project_input"],
+        input_names=[
+            "projected_encoder_out",
+            "projected_decoder_out",
+            "project_input",
+        ],
         output_names=["logit"],
         dynamic_axes={
-            "encoder_out": {0: "N"},
-            "decoder_out": {0: "N"},
+            "projected_encoder_out": {0: "N"},
+            "projected_decoder_out": {0: "N"},
             "logit": {0: "N"},
         },
     )
-    torch.onnx.export(
-        joiner_model.encoder_proj,
-        (encoder_out.squeeze(0).squeeze(0)),
-        str(joiner_filename).replace(".onnx", "_encoder_proj.onnx"),
-        verbose=False,
-        opset_version=opset_version,
-        input_names=["encoder_out"],
-        output_names=["encoder_proj"],
-        dynamic_axes={
-            "encoder_out": {0: "N"},
-            "encoder_proj": {0: "N"},
-        },
-    )
-    torch.onnx.export(
-        joiner_model.decoder_proj,
-        (decoder_out.squeeze(0).squeeze(0)),
-        str(joiner_filename).replace(".onnx", "_decoder_proj.onnx"),
-        verbose=False,
-        opset_version=opset_version,
-        input_names=["decoder_out"],
-        output_names=["decoder_proj"],
-        dynamic_axes={
-            "decoder_out": {0: "N"},
-            "decoder_proj": {0: "N"},
-        },
-    )
     logging.info(f"Saved to {joiner_filename}")
 
-
-def add_variables(
-    model: nn.Module, combined_model: onnx.ModelProto
-) -> onnx.ModelProto:
-    graph = gs.import_onnx(combined_model)
-
-    blank_id = model.decoder.blank_id
-    unk_id = getattr(model, "unk_id", blank_id)
-    context_size = model.decoder.context_size
-
-    node = gs.Node(
-        op="Identity",
-        name="constants_lm",
-        attrs={
-            "blank_id": blank_id,
-            "unk_id": unk_id,
-            "context_size": context_size,
+    encoder_out = torch.rand(1, encoder_out_dim, dtype=torch.float32)
+    torch.onnx.export(
+        joiner_model.encoder_proj,
+        encoder_out,
+        encoder_proj_filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["encoder_out"],
+        output_names=["projected_encoder_out"],
+        dynamic_axes={
+            "encoder_out": {0: "N"},
+            "projected_encoder_out": {0: "N"},
         },
-        inputs=[],
-        outputs=[],
     )
-    graph.nodes.append(node)
+    logging.info(f"Saved to {encoder_proj_filename}")
 
-    graph = gs.export_onnx(graph)
-    return graph
-
-
-def export_all_in_one_onnx(
-    model: nn.Module,
-    encoder_filename: str,
-    decoder_filename: str,
-    joiner_filename: str,
-    all_in_one_filename: str,
-):
-    encoder_onnx = onnx.load(encoder_filename)
-    decoder_onnx = onnx.load(decoder_filename)
-    joiner_onnx = onnx.load(joiner_filename)
-    joiner_encoder_proj_onnx = onnx.load(
-        str(joiner_filename).replace(".onnx", "_encoder_proj.onnx")
+    decoder_out = torch.rand(1, decoder_out_dim, dtype=torch.float32)
+    torch.onnx.export(
+        joiner_model.decoder_proj,
+        decoder_out,
+        decoder_proj_filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["decoder_out"],
+        output_names=["projected_decoder_out"],
+        dynamic_axes={
+            "decoder_out": {0: "N"},
+            "projected_decoder_out": {0: "N"},
+        },
     )
-    joiner_decoder_proj_onnx = onnx.load(
-        str(joiner_filename).replace(".onnx", "_decoder_proj.onnx")
-    )
-
-    encoder_onnx = onnx.compose.add_prefix(encoder_onnx, prefix="encoder/")
-    decoder_onnx = onnx.compose.add_prefix(decoder_onnx, prefix="decoder/")
-    joiner_onnx = onnx.compose.add_prefix(joiner_onnx, prefix="joiner/")
-    joiner_encoder_proj_onnx = onnx.compose.add_prefix(
-        joiner_encoder_proj_onnx, prefix="joiner_encoder_proj/"
-    )
-    joiner_decoder_proj_onnx = onnx.compose.add_prefix(
-        joiner_decoder_proj_onnx, prefix="joiner_decoder_proj/"
-    )
-
-    combined_model = onnx.compose.merge_models(
-        encoder_onnx, decoder_onnx, io_map={}
-    )
-    combined_model = onnx.compose.merge_models(
-        combined_model, joiner_onnx, io_map={}
-    )
-    combined_model = onnx.compose.merge_models(
-        combined_model, joiner_encoder_proj_onnx, io_map={}
-    )
-    combined_model = onnx.compose.merge_models(
-        combined_model, joiner_decoder_proj_onnx, io_map={}
-    )
-    combined_model = add_variables(model, combined_model)
-    onnx.save(combined_model, all_in_one_filename)
-    logging.info(f"Saved to {all_in_one_filename}")
+    logging.info(f"Saved to {decoder_proj_filename}")
 
 
 @torch.no_grad()
@@ -704,15 +666,6 @@ def main():
             joiner_filename,
             opset_version=opset_version,
         )
-
-        all_in_one_filename = params.exp_dir / "all_in_one.onnx"
-        export_all_in_one_onnx(
-            model,
-            encoder_filename,
-            decoder_filename,
-            joiner_filename,
-            all_in_one_filename,
-        )
     elif params.jit is True:
         convert_scaled_to_non_scaled(model, inplace=True)
         logging.info("Using torch.jit.script()")
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check.py b/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check.py
index a04b408d8..fb9adb44a 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check.py
@@ -84,11 +84,13 @@ def test_encoder(
     model: torch.jit.ScriptModule,
     encoder_session: ort.InferenceSession,
 ):
-    encoder_inputs = encoder_session.get_inputs()
-    assert encoder_inputs[0].name == "x"
-    assert encoder_inputs[1].name == "x_lens"
-    assert encoder_inputs[0].shape == ["N", "T", 80]
-    assert encoder_inputs[1].shape == ["N"]
+    inputs = encoder_session.get_inputs()
+    outputs = encoder_session.get_outputs()
+    input_names = [n.name for n in inputs]
+    output_names = [n.name for n in outputs]
+
+    assert inputs[0].shape == ["N", "T", 80]
+    assert inputs[1].shape == ["N"]
 
     for N in [1, 5]:
         for T in [12, 25]:
@@ -98,11 +100,11 @@ def test_encoder(
             x_lens[0] = T
 
             encoder_inputs = {
-                "x": x.numpy(),
-                "x_lens": x_lens.numpy(),
+                input_names[0]: x.numpy(),
+                input_names[1]: x_lens.numpy(),
             }
             encoder_out, encoder_out_lens = encoder_session.run(
-                ["encoder_out", "encoder_out_lens"],
+                output_names,
                 encoder_inputs,
             )
 
@@ -110,7 +112,9 @@ def test_encoder(
 
             encoder_out = torch.from_numpy(encoder_out)
             assert torch.allclose(encoder_out, torch_encoder_out, atol=1e-05), (
-                (encoder_out - torch_encoder_out).abs().max()
+                (encoder_out - torch_encoder_out).abs().max(),
+                encoder_out.shape,
+                torch_encoder_out.shape,
             )
 
 
@@ -118,15 +122,18 @@ def test_decoder(
     model: torch.jit.ScriptModule,
     decoder_session: ort.InferenceSession,
 ):
-    decoder_inputs = decoder_session.get_inputs()
-    assert decoder_inputs[0].name == "y"
-    assert decoder_inputs[0].shape == ["N", 2]
+    inputs = decoder_session.get_inputs()
+    outputs = decoder_session.get_outputs()
+    input_names = [n.name for n in inputs]
+    output_names = [n.name for n in outputs]
+
+    assert inputs[0].shape == ["N", 2]
     for N in [1, 5, 10]:
         y = torch.randint(low=1, high=500, size=(10, 2))
 
-        decoder_inputs = {"y": y.numpy()}
+        decoder_inputs = {input_names[0]: y.numpy()}
         decoder_out = decoder_session.run(
-            ["decoder_out"],
+            output_names,
             decoder_inputs,
         )[0]
         decoder_out = torch.from_numpy(decoder_out)
@@ -144,51 +151,62 @@ def test_joiner(
     joiner_decoder_proj_session: ort.InferenceSession,
 ):
     joiner_inputs = joiner_session.get_inputs()
-    assert joiner_inputs[0].name == "encoder_out"
-    assert joiner_inputs[0].shape == ["N", 1, 1, 512]
+    joiner_outputs = joiner_session.get_outputs()
+    joiner_input_names = [n.name for n in joiner_inputs]
+    joiner_output_names = [n.name for n in joiner_outputs]
 
-    assert joiner_inputs[1].name == "decoder_out"
-    assert joiner_inputs[1].shape == ["N", 1, 1, 512]
+    assert joiner_inputs[0].shape == ["N", 512]
+    assert joiner_inputs[1].shape == ["N", 512]
 
     joiner_encoder_proj_inputs = joiner_encoder_proj_session.get_inputs()
-    assert joiner_encoder_proj_inputs[0].name == "encoder_out"
+    encoder_proj_input_name = joiner_encoder_proj_inputs[0].name
+
     assert joiner_encoder_proj_inputs[0].shape == ["N", 512]
 
+    joiner_encoder_proj_outputs = joiner_encoder_proj_session.get_outputs()
+    encoder_proj_output_name = joiner_encoder_proj_outputs[0].name
+
     joiner_decoder_proj_inputs = joiner_decoder_proj_session.get_inputs()
-    assert joiner_decoder_proj_inputs[0].name == "decoder_out"
+    decoder_proj_input_name = joiner_decoder_proj_inputs[0].name
+
     assert joiner_decoder_proj_inputs[0].shape == ["N", 512]
 
+    joiner_decoder_proj_outputs = joiner_decoder_proj_session.get_outputs()
+    decoder_proj_output_name = joiner_decoder_proj_outputs[0].name
+
     for N in [1, 5, 10]:
-        encoder_out = torch.rand(N, 1, 1, 512)
-        decoder_out = torch.rand(N, 1, 1, 512)
+        encoder_out = torch.rand(N, 512)
+        decoder_out = torch.rand(N, 512)
+
+        projected_encoder_out = torch.rand(N, 512)
+        projected_decoder_out = torch.rand(N, 512)
 
         joiner_inputs = {
-            "encoder_out": encoder_out.numpy(),
-            "decoder_out": decoder_out.numpy(),
+            joiner_input_names[0]: projected_encoder_out.numpy(),
+            joiner_input_names[1]: projected_decoder_out.numpy(),
         }
-        joiner_out = joiner_session.run(["logit"], joiner_inputs)[0]
+        joiner_out = joiner_session.run(joiner_output_names, joiner_inputs)[0]
         joiner_out = torch.from_numpy(joiner_out)
 
         torch_joiner_out = model.joiner(
-            encoder_out,
-            decoder_out,
-            project_input=True,
+            projected_encoder_out,
+            projected_decoder_out,
+            project_input=False,
         )
         assert torch.allclose(joiner_out, torch_joiner_out, atol=1e-5), (
             (joiner_out - torch_joiner_out).abs().max()
         )
 
+        # Now test encoder_proj
         joiner_encoder_proj_inputs = {
-            "encoder_out": encoder_out.squeeze(1).squeeze(1).numpy()
+            encoder_proj_input_name: encoder_out.numpy()
         }
         joiner_encoder_proj_out = joiner_encoder_proj_session.run(
-            ["encoder_proj"], joiner_encoder_proj_inputs
+            [encoder_proj_output_name], joiner_encoder_proj_inputs
         )[0]
         joiner_encoder_proj_out = torch.from_numpy(joiner_encoder_proj_out)
 
-        torch_joiner_encoder_proj_out = model.joiner.encoder_proj(
-            encoder_out.squeeze(1).squeeze(1)
-        )
+        torch_joiner_encoder_proj_out = model.joiner.encoder_proj(encoder_out)
         assert torch.allclose(
             joiner_encoder_proj_out, torch_joiner_encoder_proj_out, atol=1e-5
         ), (
@@ -197,17 +215,16 @@ def test_joiner(
             .max()
         )
 
+        # Now test decoder_proj
         joiner_decoder_proj_inputs = {
-            "decoder_out": decoder_out.squeeze(1).squeeze(1).numpy()
+            decoder_proj_input_name: decoder_out.numpy()
         }
         joiner_decoder_proj_out = joiner_decoder_proj_session.run(
-            ["decoder_proj"], joiner_decoder_proj_inputs
+            [decoder_proj_output_name], joiner_decoder_proj_inputs
         )[0]
         joiner_decoder_proj_out = torch.from_numpy(joiner_decoder_proj_out)
 
-        torch_joiner_decoder_proj_out = model.joiner.decoder_proj(
-            decoder_out.squeeze(1).squeeze(1)
-        )
+        torch_joiner_decoder_proj_out = model.joiner.decoder_proj(decoder_out)
         assert torch.allclose(
             joiner_decoder_proj_out, torch_joiner_decoder_proj_out, atol=1e-5
         ), (
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check_all_in_one.py b/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check_all_in_one.py
deleted file mode 100755
index b4cf8c94a..000000000
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_check_all_in_one.py
+++ /dev/null
@@ -1,284 +0,0 @@
-#!/usr/bin/env python3
-#
-# Copyright 2022 Xiaomi Corporation (Author: Yunus Emre Ozkose)
-#
-# See ../../../../LICENSE for clarification regarding multiple authors
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""
-This script checks that exported onnx models produce the same output
-with the given torchscript model for the same input.
-"""
-
-import argparse
-import logging
-import os
-
-import onnx
-import onnx_graphsurgeon as gs
-import onnxruntime
-import onnxruntime as ort
-import torch
-
-ort.set_default_logger_severity(3)
-
-
-def get_parser():
-    parser = argparse.ArgumentParser(
-        formatter_class=argparse.ArgumentDefaultsHelpFormatter
-    )
-
-    parser.add_argument(
-        "--jit-filename",
-        required=True,
-        type=str,
-        help="Path to the torchscript model",
-    )
-
-    parser.add_argument(
-        "--onnx-all-in-one-filename",
-        required=True,
-        type=str,
-        help="Path to the onnx all in one model",
-    )
-
-    return parser
-
-
-def test_encoder(
-    model: torch.jit.ScriptModule,
-    encoder_session: ort.InferenceSession,
-):
-    encoder_inputs = encoder_session.get_inputs()
-    assert encoder_inputs[0].shape == ["N", "T", 80]
-    assert encoder_inputs[1].shape == ["N"]
-    encoder_input_names = [i.name for i in encoder_inputs]
-    encoder_output_names = [i.name for i in encoder_session.get_outputs()]
-
-    for N in [1, 5]:
-        for T in [12, 25]:
-            print("N, T", N, T)
-            x = torch.rand(N, T, 80, dtype=torch.float32)
-            x_lens = torch.randint(low=10, high=T + 1, size=(N,))
-            x_lens[0] = T
-
-            encoder_inputs = {
-                encoder_input_names[0]: x.numpy(),
-                encoder_input_names[1]: x_lens.numpy(),
-            }
-            encoder_out, encoder_out_lens = encoder_session.run(
-                [encoder_output_names[1], encoder_output_names[0]],
-                encoder_inputs,
-            )
-
-            torch_encoder_out, torch_encoder_out_lens = model.encoder(x, x_lens)
-
-            encoder_out = torch.from_numpy(encoder_out)
-            assert torch.allclose(encoder_out, torch_encoder_out, atol=1e-05), (
-                (encoder_out - torch_encoder_out).abs().max()
-            )
-
-
-def test_decoder(
-    model: torch.jit.ScriptModule,
-    decoder_session: ort.InferenceSession,
-):
-    decoder_inputs = decoder_session.get_inputs()
-    assert decoder_inputs[0].shape == ["N", 2]
-    decoder_input_names = [i.name for i in decoder_inputs]
-    decoder_output_names = [i.name for i in decoder_session.get_outputs()]
-
-    for N in [1, 5, 10]:
-        y = torch.randint(low=1, high=500, size=(10, 2))
-
-        decoder_inputs = {decoder_input_names[0]: y.numpy()}
-        decoder_out = decoder_session.run(
-            [decoder_output_names[0]],
-            decoder_inputs,
-        )[0]
-        decoder_out = torch.from_numpy(decoder_out)
-
-        torch_decoder_out = model.decoder(y, need_pad=False)
-        assert torch.allclose(decoder_out, torch_decoder_out, atol=1e-5), (
-            (decoder_out - torch_decoder_out).abs().max()
-        )
-
-
-def test_joiner(
-    model: torch.jit.ScriptModule,
-    joiner_session: ort.InferenceSession,
-):
-    joiner_inputs = joiner_session.get_inputs()
-    assert joiner_inputs[0].shape == ["N", 512]
-    assert joiner_inputs[1].shape == ["N", 512]
-    joiner_input_names = [i.name for i in joiner_inputs]
-    joiner_output_names = [i.name for i in joiner_session.get_outputs()]
-
-    for N in [1, 5, 10]:
-        encoder_out = torch.rand(N, 512)
-        decoder_out = torch.rand(N, 512)
-
-        joiner_inputs = {
-            joiner_input_names[0]: encoder_out.numpy(),
-            joiner_input_names[1]: decoder_out.numpy(),
-        }
-        joiner_out = joiner_session.run(
-            [joiner_output_names[0]], joiner_inputs
-        )[0]
-        joiner_out = torch.from_numpy(joiner_out)
-
-        torch_joiner_out = model.joiner(
-            encoder_out,
-            decoder_out,
-            project_input=True,
-        )
-        assert torch.allclose(joiner_out, torch_joiner_out, atol=1e-5), (
-            (joiner_out - torch_joiner_out).abs().max()
-        )
-
-
-def extract_sub_model(
-    onnx_graph: onnx.ModelProto,
-    input_op_names: list,
-    output_op_names: list,
-    non_verbose=False,
-):
-    onnx_graph = onnx.shape_inference.infer_shapes(onnx_graph)
-    graph = gs.import_onnx(onnx_graph)
-    graph.cleanup().toposort()
-
-    # Extraction of input OP and output OP
-    graph_node_inputs = [
-        graph_nodes
-        for graph_nodes in graph.nodes
-        for graph_nodes_input in graph_nodes.inputs
-        if graph_nodes_input.name in input_op_names
-    ]
-    graph_node_outputs = [
-        graph_nodes
-        for graph_nodes in graph.nodes
-        for graph_nodes_output in graph_nodes.outputs
-        if graph_nodes_output.name in output_op_names
-    ]
-
-    # Init graph INPUT/OUTPUT
-    graph.inputs.clear()
-    graph.outputs.clear()
-
-    # Update graph INPUT/OUTPUT
-    graph.inputs = [
-        graph_node_input
-        for graph_node in graph_node_inputs
-        for graph_node_input in graph_node.inputs
-        if graph_node_input.shape
-    ]
-    graph.outputs = [
-        graph_node_output
-        for graph_node in graph_node_outputs
-        for graph_node_output in graph_node.outputs
-    ]
-
-    # Cleanup
-    graph.cleanup().toposort()
-
-    # Shape Estimation
-    extracted_graph = None
-    try:
-        extracted_graph = onnx.shape_inference.infer_shapes(
-            gs.export_onnx(graph)
-        )
-    except Exception:
-        extracted_graph = gs.export_onnx(graph)
-        if not non_verbose:
-            print(
-                "WARNING: "
-                + "The input shape of the next OP does not match the output shape. "
-                + "Be sure to open the .onnx file to verify the certainty of the geometry."
-            )
-    return extracted_graph
-
-
-def extract_encoder(onnx_model: onnx.ModelProto):
-    encoder_ = extract_sub_model(
-        onnx_model,
-        ["encoder/x", "encoder/x_lens"],
-        ["encoder/encoder_out", "encoder/encoder_out_lens"],
-        False,
-    )
-    onnx.save(encoder_, "tmp_encoder.onnx")
-    onnx.checker.check_model(encoder_)
-    sess = onnxruntime.InferenceSession("tmp_encoder.onnx")
-    os.remove("tmp_encoder.onnx")
-    return sess
-
-
-def extract_decoder(onnx_model: onnx.ModelProto):
-    decoder_ = extract_sub_model(
-        onnx_model, ["decoder/y"], ["decoder/decoder_out"], False
-    )
-    onnx.save(decoder_, "tmp_decoder.onnx")
-    onnx.checker.check_model(decoder_)
-    sess = onnxruntime.InferenceSession("tmp_decoder.onnx")
-    os.remove("tmp_decoder.onnx")
-    return sess
-
-
-def extract_joiner(onnx_model: onnx.ModelProto):
-    joiner_ = extract_sub_model(
-        onnx_model,
-        ["joiner/encoder_out", "joiner/decoder_out"],
-        ["joiner/logit"],
-        False,
-    )
-    onnx.save(joiner_, "tmp_joiner.onnx")
-    onnx.checker.check_model(joiner_)
-    sess = onnxruntime.InferenceSession("tmp_joiner.onnx")
-    os.remove("tmp_joiner.onnx")
-    return sess
-
-
-@torch.no_grad()
-def main():
-    args = get_parser().parse_args()
-    logging.info(vars(args))
-
-    model = torch.jit.load(args.jit_filename)
-    onnx_model = onnx.load(args.onnx_all_in_one_filename)
-
-    options = ort.SessionOptions()
-    options.inter_op_num_threads = 1
-    options.intra_op_num_threads = 1
-
-    logging.info("Test encoder")
-    encoder_session = extract_encoder(onnx_model)
-    test_encoder(model, encoder_session)
-
-    logging.info("Test decoder")
-    decoder_session = extract_decoder(onnx_model)
-    test_decoder(model, decoder_session)
-
-    logging.info("Test joiner")
-    joiner_session = extract_joiner(onnx_model)
-    test_joiner(model, joiner_session)
-    logging.info("Finished checking ONNX models")
-
-
-if __name__ == "__main__":
-    torch.manual_seed(20220727)
-    formatter = (
-        "%(asctime)s %(levelname)s [%(filename)s:%(lineno)d] %(message)s"
-    )
-
-    logging.basicConfig(format=formatter, level=logging.INFO)
-    main()
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_pretrained.py b/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_pretrained.py
index 3e4a323aa..034217ad9 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_pretrained.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/onnx_pretrained.py
@@ -59,21 +59,35 @@ def get_parser():
         "--encoder-model-filename",
         type=str,
         required=True,
-        help="Path to the encoder torchscript model. ",
+        help="Path to the encoder onnx model. ",
     )
 
     parser.add_argument(
         "--decoder-model-filename",
         type=str,
         required=True,
-        help="Path to the decoder torchscript model. ",
+        help="Path to the decoder onnx model. ",
     )
 
     parser.add_argument(
         "--joiner-model-filename",
         type=str,
         required=True,
-        help="Path to the joiner torchscript model. ",
+        help="Path to the joiner onnx model. ",
+    )
+
+    parser.add_argument(
+        "--joiner-encoder-proj-model-filename",
+        type=str,
+        required=True,
+        help="Path to the joiner encoder_proj onnx model. ",
+    )
+
+    parser.add_argument(
+        "--joiner-decoder-proj-model-filename",
+        type=str,
+        required=True,
+        help="Path to the joiner decoder_proj onnx model. ",
     )
 
     parser.add_argument(
@@ -136,6 +150,8 @@ def read_sound_files(
 def greedy_search(
     decoder: ort.InferenceSession,
     joiner: ort.InferenceSession,
+    joiner_encoder_proj: ort.InferenceSession,
+    joiner_decoder_proj: ort.InferenceSession,
     encoder_out: np.ndarray,
     encoder_out_lens: np.ndarray,
     context_size: int,
@@ -146,6 +162,10 @@ def greedy_search(
         The decoder model.
       joiner:
         The joiner model.
+      joiner_encoder_proj:
+        The joiner encoder projection model.
+      joiner_decoder_proj:
+        The joiner decoder projection model.
       encoder_out:
         A 3-D tensor of shape (N, T, C)
       encoder_out_lens:
@@ -167,6 +187,15 @@ def greedy_search(
         enforce_sorted=False,
     )
 
+    projected_encoder_out = joiner_encoder_proj.run(
+        [joiner_encoder_proj.get_outputs()[0].name],
+        {
+            joiner_encoder_proj.get_inputs()[
+                0
+            ].name: packed_encoder_out.data.numpy()
+        },
+    )[0]
+
     blank_id = 0  # hard-code to 0
 
     batch_size_list = packed_encoder_out.batch_sizes.tolist()
@@ -194,30 +223,28 @@ def greedy_search(
             decoder_input_nodes[0].name: decoder_input.numpy(),
         },
     )[0].squeeze(1)
-    decoder_out = torch.from_numpy(decoder_out)
+    projected_decoder_out = joiner_decoder_proj.run(
+        [joiner_decoder_proj.get_outputs()[0].name],
+        {joiner_decoder_proj.get_inputs()[0].name: decoder_out},
+    )[0]
+
+    projected_decoder_out = torch.from_numpy(projected_decoder_out)
 
     offset = 0
     for batch_size in batch_size_list:
         start = offset
         end = offset + batch_size
-        current_encoder_out = packed_encoder_out.data[start:end]
-        current_encoder_out = current_encoder_out
+        current_encoder_out = projected_encoder_out[start:end]
         # current_encoder_out's shape: (batch_size, encoder_out_dim)
         offset = end
 
-        decoder_out = decoder_out[:batch_size]
+        projected_decoder_out = projected_decoder_out[:batch_size]
 
         logits = joiner.run(
             [joiner_output_nodes[0].name],
             {
-                joiner_input_nodes[0]
-                .name: current_encoder_out.unsqueeze(1)
-                .unsqueeze(1)
-                .numpy(),
-                joiner_input_nodes[1]
-                .name: decoder_out.unsqueeze(1)
-                .unsqueeze(1)
-                .numpy(),
+                joiner_input_nodes[0].name: current_encoder_out,
+                joiner_input_nodes[1].name: projected_decoder_out.numpy(),
             },
         )[0]
         logits = torch.from_numpy(logits).squeeze(1).squeeze(1)
@@ -243,7 +270,11 @@ def greedy_search(
                     decoder_input_nodes[0].name: decoder_input.numpy(),
                 },
             )[0].squeeze(1)
-            decoder_out = torch.from_numpy(decoder_out)
+            projected_decoder_out = joiner_decoder_proj.run(
+                [joiner_decoder_proj.get_outputs()[0].name],
+                {joiner_decoder_proj.get_inputs()[0].name: decoder_out},
+            )[0]
+            projected_decoder_out = torch.from_numpy(projected_decoder_out)
 
     sorted_ans = [h[context_size:] for h in hyps]
     ans = []
@@ -279,6 +310,16 @@ def main():
         sess_options=session_opts,
     )
 
+    joiner_encoder_proj = ort.InferenceSession(
+        args.joiner_encoder_proj_model_filename,
+        sess_options=session_opts,
+    )
+
+    joiner_decoder_proj = ort.InferenceSession(
+        args.joiner_decoder_proj_model_filename,
+        sess_options=session_opts,
+    )
+
     sp = spm.SentencePieceProcessor()
     sp.load(args.bpe_model)
 
@@ -323,6 +364,8 @@ def main():
     hyps = greedy_search(
         decoder=decoder,
         joiner=joiner,
+        joiner_encoder_proj=joiner_encoder_proj,
+        joiner_decoder_proj=joiner_decoder_proj,
         encoder_out=encoder_out,
         encoder_out_lens=encoder_out_lens,
         context_size=args.context_size,
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/test_onnx.py b/egs/librispeech/ASR/pruned_transducer_stateless3/test_onnx.py
new file mode 100755
index 000000000..c55268b14
--- /dev/null
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/test_onnx.py
@@ -0,0 +1,401 @@
+#!/usr/bin/env python3
+# Copyright    2022  Xiaomi Corp.        (authors: Fangjun Kuang)
+#
+# See ../../../../LICENSE for clarification regarding multiple authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+"""
+This file is to test that models can be exported to onnx.
+"""
+import os
+
+import onnxruntime as ort
+import torch
+from conformer import (
+    Conformer,
+    ConformerEncoder,
+    ConformerEncoderLayer,
+    Conv2dSubsampling,
+    RelPositionalEncoding,
+)
+from scaling_converter import convert_scaled_to_non_scaled
+
+from icefall.utils import make_pad_mask
+
+ort.set_default_logger_severity(3)
+
+
+def test_conv2d_subsampling():
+    filename = "conv2d_subsampling.onnx"
+    opset_version = 11
+    N = 30
+    T = 50
+    num_features = 80
+    d_model = 512
+    x = torch.rand(N, T, num_features)
+
+    encoder_embed = Conv2dSubsampling(num_features, d_model)
+    encoder_embed.eval()
+    encoder_embed = convert_scaled_to_non_scaled(encoder_embed, inplace=True)
+
+    jit_model = torch.jit.trace(encoder_embed, x)
+
+    torch.onnx.export(
+        encoder_embed,
+        x,
+        filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["x"],
+        output_names=["y"],
+        dynamic_axes={
+            "x": {0: "N", 1: "T"},
+            "y": {0: "N", 1: "T"},
+        },
+    )
+
+    options = ort.SessionOptions()
+    options.inter_op_num_threads = 1
+    options.intra_op_num_threads = 1
+
+    session = ort.InferenceSession(
+        filename,
+        sess_options=options,
+    )
+
+    input_nodes = session.get_inputs()
+    assert input_nodes[0].name == "x"
+    assert input_nodes[0].shape == ["N", "T", num_features]
+
+    inputs = {input_nodes[0].name: x.numpy()}
+
+    onnx_y = session.run(["y"], inputs)[0]
+
+    onnx_y = torch.from_numpy(onnx_y)
+    torch_y = jit_model(x)
+    assert torch.allclose(onnx_y, torch_y, atol=1e-05), (
+        (onnx_y - torch_y).abs().max()
+    )
+
+    os.remove(filename)
+
+
+def test_rel_pos():
+    filename = "rel_pos.onnx"
+
+    opset_version = 11
+    N = 30
+    T = 50
+    num_features = 80
+    d_model = 512
+    x = torch.rand(N, T, num_features)
+
+    encoder_pos = RelPositionalEncoding(d_model, dropout_rate=0.1)
+    encoder_pos.eval()
+    encoder_pos = convert_scaled_to_non_scaled(encoder_pos, inplace=True)
+
+    jit_model = torch.jit.trace(encoder_pos, x)
+
+    torch.onnx.export(
+        encoder_pos,
+        x,
+        filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["x"],
+        output_names=["y", "pos_emb"],
+        dynamic_axes={
+            "x": {0: "N", 1: "T"},
+            "y": {0: "N", 1: "T"},
+            "pos_emb": {0: "N", 1: "T"},
+        },
+    )
+
+    options = ort.SessionOptions()
+    options.inter_op_num_threads = 1
+    options.intra_op_num_threads = 1
+
+    session = ort.InferenceSession(
+        filename,
+        sess_options=options,
+    )
+
+    input_nodes = session.get_inputs()
+    assert input_nodes[0].name == "x"
+    assert input_nodes[0].shape == ["N", "T", num_features]
+
+    inputs = {input_nodes[0].name: x.numpy()}
+    onnx_y, onnx_pos_emb = session.run(["y", "pos_emb"], inputs)
+    onnx_y = torch.from_numpy(onnx_y)
+    onnx_pos_emb = torch.from_numpy(onnx_pos_emb)
+
+    torch_y, torch_pos_emb = jit_model(x)
+    assert torch.allclose(onnx_y, torch_y, atol=1e-05), (
+        (onnx_y - torch_y).abs().max()
+    )
+
+    assert torch.allclose(onnx_pos_emb, torch_pos_emb, atol=1e-05), (
+        (onnx_pos_emb - torch_pos_emb).abs().max()
+    )
+    print(onnx_y.abs().sum(), torch_y.abs().sum())
+    print(onnx_pos_emb.abs().sum(), torch_pos_emb.abs().sum())
+
+    os.remove(filename)
+
+
+def test_conformer_encoder_layer():
+    filename = "conformer_encoder_layer.onnx"
+    opset_version = 11
+    N = 30
+    T = 50
+
+    d_model = 512
+    nhead = 8
+    dim_feedforward = 2048
+    dropout = 0.1
+    layer_dropout = 0.075
+    cnn_module_kernel = 31
+    causal = False
+
+    x = torch.rand(N, T, d_model)
+    x_lens = torch.full((N,), fill_value=T, dtype=torch.int64)
+    src_key_padding_mask = make_pad_mask(x_lens)
+
+    encoder_pos = RelPositionalEncoding(d_model, dropout)
+    encoder_pos.eval()
+    encoder_pos = convert_scaled_to_non_scaled(encoder_pos, inplace=True)
+
+    x, pos_emb = encoder_pos(x)
+    x = x.permute(1, 0, 2)
+
+    encoder_layer = ConformerEncoderLayer(
+        d_model,
+        nhead,
+        dim_feedforward,
+        dropout,
+        layer_dropout,
+        cnn_module_kernel,
+        causal,
+    )
+    encoder_layer.eval()
+    encoder_layer = convert_scaled_to_non_scaled(encoder_layer, inplace=True)
+
+    jit_model = torch.jit.trace(
+        encoder_layer, (x, pos_emb, src_key_padding_mask)
+    )
+
+    torch.onnx.export(
+        encoder_layer,
+        (x, pos_emb, src_key_padding_mask),
+        filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["x", "pos_emb", "src_key_padding_mask"],
+        output_names=["y"],
+        dynamic_axes={
+            "x": {0: "T", 1: "N"},
+            "pos_emb": {0: "N", 1: "T"},
+            "src_key_padding_mask": {0: "N", 1: "T"},
+            "y": {0: "T", 1: "N"},
+        },
+    )
+
+    options = ort.SessionOptions()
+    options.inter_op_num_threads = 1
+    options.intra_op_num_threads = 1
+
+    session = ort.InferenceSession(
+        filename,
+        sess_options=options,
+    )
+
+    input_nodes = session.get_inputs()
+    inputs = {
+        input_nodes[0].name: x.numpy(),
+        input_nodes[1].name: pos_emb.numpy(),
+        input_nodes[2].name: src_key_padding_mask.numpy(),
+    }
+    onnx_y = session.run(["y"], inputs)[0]
+    onnx_y = torch.from_numpy(onnx_y)
+
+    torch_y = jit_model(x, pos_emb, src_key_padding_mask)
+    assert torch.allclose(onnx_y, torch_y, atol=1e-05), (
+        (onnx_y - torch_y).abs().max()
+    )
+
+    print(onnx_y.abs().sum(), torch_y.abs().sum(), onnx_y.shape, torch_y.shape)
+
+    os.remove(filename)
+
+
+def test_conformer_encoder():
+    filename = "conformer_encoder.onnx"
+
+    opset_version = 11
+    N = 3
+    T = 15
+
+    d_model = 512
+    nhead = 8
+    dim_feedforward = 2048
+    dropout = 0.1
+    layer_dropout = 0.075
+    cnn_module_kernel = 31
+    causal = False
+    num_encoder_layers = 12
+
+    x = torch.rand(N, T, d_model)
+    x_lens = torch.full((N,), fill_value=T, dtype=torch.int64)
+    src_key_padding_mask = make_pad_mask(x_lens)
+
+    encoder_pos = RelPositionalEncoding(d_model, dropout)
+    encoder_pos.eval()
+    encoder_pos = convert_scaled_to_non_scaled(encoder_pos, inplace=True)
+
+    x, pos_emb = encoder_pos(x)
+    x = x.permute(1, 0, 2)
+
+    encoder_layer = ConformerEncoderLayer(
+        d_model,
+        nhead,
+        dim_feedforward,
+        dropout,
+        layer_dropout,
+        cnn_module_kernel,
+        causal,
+    )
+    encoder = ConformerEncoder(encoder_layer, num_encoder_layers)
+    encoder.eval()
+    encoder = convert_scaled_to_non_scaled(encoder, inplace=True)
+
+    jit_model = torch.jit.trace(encoder, (x, pos_emb, src_key_padding_mask))
+
+    torch.onnx.export(
+        encoder,
+        (x, pos_emb, src_key_padding_mask),
+        filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["x", "pos_emb", "src_key_padding_mask"],
+        output_names=["y"],
+        dynamic_axes={
+            "x": {0: "T", 1: "N"},
+            "pos_emb": {0: "N", 1: "T"},
+            "src_key_padding_mask": {0: "N", 1: "T"},
+            "y": {0: "T", 1: "N"},
+        },
+    )
+
+    options = ort.SessionOptions()
+    options.inter_op_num_threads = 1
+    options.intra_op_num_threads = 1
+
+    session = ort.InferenceSession(
+        filename,
+        sess_options=options,
+    )
+
+    input_nodes = session.get_inputs()
+    inputs = {
+        input_nodes[0].name: x.numpy(),
+        input_nodes[1].name: pos_emb.numpy(),
+        input_nodes[2].name: src_key_padding_mask.numpy(),
+    }
+    onnx_y = session.run(["y"], inputs)[0]
+    onnx_y = torch.from_numpy(onnx_y)
+
+    torch_y = jit_model(x, pos_emb, src_key_padding_mask)
+    assert torch.allclose(onnx_y, torch_y, atol=1e-05), (
+        (onnx_y - torch_y).abs().max()
+    )
+
+    print(onnx_y.abs().sum(), torch_y.abs().sum(), onnx_y.shape, torch_y.shape)
+
+    os.remove(filename)
+
+
+def test_conformer():
+    filename = "conformer.onnx"
+    opset_version = 11
+    N = 3
+    T = 15
+    num_features = 80
+    x = torch.rand(N, T, num_features)
+    x_lens = torch.full((N,), fill_value=T, dtype=torch.int64)
+
+    conformer = Conformer(num_features=num_features)
+    conformer.eval()
+    conformer = convert_scaled_to_non_scaled(conformer, inplace=True)
+
+    jit_model = torch.jit.trace(conformer, (x, x_lens))
+    torch.onnx.export(
+        conformer,
+        (x, x_lens),
+        filename,
+        verbose=False,
+        opset_version=opset_version,
+        input_names=["x", "x_lens"],
+        output_names=["y", "y_lens"],
+        dynamic_axes={
+            "x": {0: "N", 1: "T"},
+            "x_lens": {0: "N"},
+            "y": {0: "N", 1: "T"},
+            "y_lens": {0: "N"},
+        },
+    )
+    options = ort.SessionOptions()
+    options.inter_op_num_threads = 1
+    options.intra_op_num_threads = 1
+
+    session = ort.InferenceSession(
+        filename,
+        sess_options=options,
+    )
+
+    input_nodes = session.get_inputs()
+    inputs = {
+        input_nodes[0].name: x.numpy(),
+        input_nodes[1].name: x_lens.numpy(),
+    }
+    onnx_y, onnx_y_lens = session.run(["y", "y_lens"], inputs)
+    onnx_y = torch.from_numpy(onnx_y)
+    onnx_y_lens = torch.from_numpy(onnx_y_lens)
+
+    torch_y, torch_y_lens = jit_model(x, x_lens)
+    assert torch.allclose(onnx_y, torch_y, atol=1e-05), (
+        (onnx_y - torch_y).abs().max()
+    )
+
+    assert torch.allclose(onnx_y_lens, torch_y_lens, atol=1e-05), (
+        (onnx_y_lens - torch_y_lens).abs().max()
+    )
+    print(onnx_y.abs().sum(), torch_y.abs().sum(), onnx_y.shape, torch_y.shape)
+    print(onnx_y_lens, torch_y_lens)
+
+    os.remove(filename)
+
+
+@torch.no_grad()
+def main():
+    test_conv2d_subsampling()
+    test_rel_pos()
+    test_conformer_encoder_layer()
+    test_conformer_encoder()
+    test_conformer()
+
+
+if __name__ == "__main__":
+    torch.manual_seed(20221011)
+    main()
diff --git a/requirements.txt b/requirements.txt
index 258c64065..d5931e49a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,5 +7,4 @@ multi_quantization
 onnx
 onnxruntime
 --extra-index-url https://pypi.ngc.nvidia.com
-onnx_graphsurgeon
 dill