diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/test_ncnn.py b/egs/librispeech/ASR/pruned_transducer_stateless3/test_ncnn.py
new file mode 100755
index 000000000..1b48b8094
--- /dev/null
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/test_ncnn.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python3
+
+from pathlib import Path
+
+import ncnn
+import numpy as np
+import torch
+from scaling import ScaledConv2d
+from scaling_converter import scaled_conv2d_to_conv2d
+
+
+def generate_scaled_conv2d():
+    f = ScaledConv2d(in_channels=1, out_channels=2, kernel_size=3, padding=1)
+    f = scaled_conv2d_to_conv2d(f)
+    print(f)
+    x = torch.rand(1, 1, 6, 8)  # NCHW
+    m = torch.jit.trace(f, x)
+    m.save("foo/scaled_conv2d.pt")
+    print(m.graph)
+
+
+def compare_scaled_conv2d():
+    param = "foo/scaled_conv2d.ncnn.param"
+    model = "foo/scaled_conv2d.ncnn.bin"
+
+    with ncnn.Net() as net:
+        with net.create_extractor() as ex:
+            net = ncnn.Net()
+            net.load_param(param)
+            net.load_model(model)
+
+            ex = net.create_extractor()
+            x = torch.rand(1, 6, 5)  # CHW
+            ex.input("in0", ncnn.Mat(x.numpy()).clone())
+            ret, out0 = ex.extract("out0")
+            assert ret == 0
+            out0 = np.array(out0)
+            out0 = torch.from_numpy(out0)
+
+            m = torch.jit.load("foo/scaled_conv2d.pt")
+            y = m(x.unsqueeze(0)).squeeze(0)
+
+            assert torch.allclose(out0, y, atol=1e-3), (out0 - y).abs().max()
+
+
+@torch.no_grad()
+def main():
+    if not Path("foo/scaled_conv2d.ncnn.param").is_file():
+        generate_scaled_conv2d()
+    else:
+        compare_scaled_conv2d()
+
+
+if __name__ == "__main__":
+    torch.manual_seed(20220803)
+    main()