Set the seed for dataloader. (#282)

Also, suppress torch warnings about division by truncation.

egs/librispeech/ASR/pruned_transducer_stateless/train.py

@@ -33,6 +33,7 @@ export CUDA_VISIBLE_DEVICES="0,1,2,3"
 
 import argparse
 import logging
+import warnings
 from pathlib import Path
 from shutil import copyfile
 from typing import Any, Dict, Optional, Tuple
@@ -496,7 +497,11 @@ def compute_loss(
     assert loss.requires_grad == is_training
 
     info = MetricsTracker()
-    info["frames"] = (feature_lens // params.subsampling_factor).sum().item()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        info["frames"] = (
+            (feature_lens // params.subsampling_factor).sum().item()
+        )
 
     # Note: We use reduction=sum while computing the loss.
     info["loss"] = loss.detach().cpu().item()

egs/librispeech/ASR/tdnn_lstm_ctc/asr_datamodule.py

@@ -23,6 +23,7 @@ from functools import lru_cache
 from pathlib import Path
 from typing import Any, Dict, Optional
 
+import torch
 from lhotse import CutSet, Fbank, FbankConfig, load_manifest
 from lhotse.dataset import (
     BucketingSampler,
@@ -34,6 +35,7 @@ from lhotse.dataset import (
     SpecAugment,
 )
 from lhotse.dataset.input_strategies import OnTheFlyFeatures
+from lhotse.utils import fix_random_seed
 from torch.utils.data import DataLoader
 
 from icefall.utils import str2bool
@@ -301,12 +303,20 @@ class LibriSpeechAsrDataModule:
             logging.info("Loading sampler state dict")
             train_sampler.load_state_dict(sampler_state_dict)
 
+        # 'seed' is derived from the current random state, which will have
+        # previously been set in the main process.
+        seed = torch.randint(0, 100000, ()).item()
+
+        def worker_init_fn(worker_id: int):
+            fix_random_seed(seed + worker_id)
+
         train_dl = DataLoader(
             train,
             sampler=train_sampler,
             batch_size=None,
             num_workers=self.args.num_workers,
             persistent_workers=False,
+            worker_init_fn=worker_init_fn,
         )
 
         return train_dl

egs/librispeech/ASR/transducer/train.py

@@ -34,6 +34,7 @@ export CUDA_VISIBLE_DEVICES="0,1,2,3"
 
 import argparse
 import logging
+import warnings
 from pathlib import Path
 from shutil import copyfile
 from typing import Optional, Tuple
@@ -393,7 +394,11 @@ def compute_loss(
     assert loss.requires_grad == is_training
 
     info = MetricsTracker()
-    info["frames"] = (feature_lens // params.subsampling_factor).sum().item()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        info["frames"] = (
+            (feature_lens // params.subsampling_factor).sum().item()
+        )
 
     # Note: We use reduction=sum while computing the loss.
     info["loss"] = loss.detach().cpu().item()

egs/librispeech/ASR/transducer_lstm/train.py

@@ -35,6 +35,7 @@ export CUDA_VISIBLE_DEVICES="0,1,2"
 
 import argparse
 import logging
+import warnings
 from pathlib import Path
 from shutil import copyfile
 from typing import Optional, Tuple
@@ -397,7 +398,11 @@ def compute_loss(
     assert loss.requires_grad == is_training
 
     info = MetricsTracker()
-    info["frames"] = (feature_lens // params.subsampling_factor).sum().item()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        info["frames"] = (
+            (feature_lens // params.subsampling_factor).sum().item()
+        )
 
     # Note: We use reduction=sum while computing the loss.
     info["loss"] = loss.detach().cpu().item()

egs/librispeech/ASR/transducer_stateless/conformer.py

@@ -109,8 +109,11 @@ class Conformer(Transformer):
         x, pos_emb = self.encoder_pos(x)
         x = x.permute(1, 0, 2)  # (N, T, C) -> (T, N, C)
 
-        # Caution: We assume the subsampling factor is 4!
-        lengths = ((x_lens - 1) // 2 - 1) // 2
+        with warnings.catch_warnings():
+            warnings.simplefilter("ignore")
+            # Caution: We assume the subsampling factor is 4!
+            lengths = ((x_lens - 1) // 2 - 1) // 2
+
         assert x.size(0) == lengths.max().item()
         mask = make_pad_mask(lengths)
 

egs/librispeech/ASR/transducer_stateless/train.py

@@ -34,6 +34,7 @@ export CUDA_VISIBLE_DEVICES="0,1,2,3"
 
 import argparse
 import logging
+import warnings
 from pathlib import Path
 from shutil import copyfile
 from typing import Optional, Tuple
@@ -419,7 +420,11 @@ def compute_loss(
     assert loss.requires_grad == is_training
 
     info = MetricsTracker()
-    info["frames"] = (feature_lens // params.subsampling_factor).sum().item()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        info["frames"] = (
+            (feature_lens // params.subsampling_factor).sum().item()
+        )
 
     # Note: We use reduction=sum while computing the loss.
     info["loss"] = loss.detach().cpu().item()

egs/librispeech/ASR/transducer_stateless_multi_datasets/asr_datamodule.py

@@ -22,6 +22,7 @@ import logging
 from pathlib import Path
 from typing import Optional
 
+import torch
 from lhotse import CutSet, Fbank, FbankConfig
 from lhotse.dataset import (
     BucketingSampler,
@@ -34,6 +35,7 @@ from lhotse.dataset.input_strategies import (
     OnTheFlyFeatures,
     PrecomputedFeatures,
 )
+from lhotse.utils import fix_random_seed
 from torch.utils.data import DataLoader
 
 from icefall.utils import str2bool
@@ -253,12 +255,21 @@ class AsrDataModule:
             )
 
         logging.info("About to create train dataloader")
+
+        # 'seed' is derived from the current random state, which will have
+        # previously been set in the main process.
+        seed = torch.randint(0, 100000, ()).item()
+
+        def worker_init_fn(worker_id: int):
+            fix_random_seed(seed + worker_id)
+
         train_dl = DataLoader(
             train,
             sampler=train_sampler,
             batch_size=None,
             num_workers=self.args.num_workers,
             persistent_workers=False,
+            worker_init_fn=worker_init_fn,
         )
         return train_dl
 

egs/librispeech/ASR/transducer_stateless_multi_datasets/train.py

@@ -58,6 +58,7 @@ export CUDA_VISIBLE_DEVICES="0,1,2,3"
 import argparse
 import logging
 import random
+import warnings
 from pathlib import Path
 from shutil import copyfile
 from typing import Optional, Tuple
@@ -466,7 +467,11 @@ def compute_loss(
     assert loss.requires_grad == is_training
 
     info = MetricsTracker()
-    info["frames"] = (feature_lens // params.subsampling_factor).sum().item()
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        info["frames"] = (
+            (feature_lens // params.subsampling_factor).sum().item()
+        )
 
     # Note: We use reduction=sum while computing the loss.
     info["loss"] = loss.detach().cpu().item()