add sid dataloader for training, test=doc

examples/voxceleb/sv0/local/train.py

@@ -11,16 +11,21 @@
 # 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.
-import os
 import argparse
+import os
 
 import paddle
+from paddle.io import DataLoader
+from paddle.io import DistributedBatchSampler
 
 from paddleaudio.datasets.voxceleb import VoxCeleb1
+from paddlespeech.vector.datasets.batch import waveform_collate_fn
+from paddlespeech.vector.layers.loss import AdditiveAngularMargin
+from paddlespeech.vector.layers.loss import LogSoftmaxWrapper
 from paddlespeech.vector.layers.lr import CyclicLRScheduler
 from paddlespeech.vector.models.ecapa_tdnn import EcapaTdnn
 from paddlespeech.vector.training.sid_model import SpeakerIdetification
-from paddlespeech.vector.layers.loss import AdditiveAngularMargin, LogSoftmaxWrapper
+
 
 def main(args):
     # stage0: set the training device, cpu or gpu
@@ -61,7 +66,6 @@ def main(args):
     criterion = LogSoftmaxWrapper(
         loss_fn=AdditiveAngularMargin(margin=0.2, scale=30))
 
-    
     # stage7: confirm training start epoch
     #         if pre-trained model exists, start epoch confirmed by the pre-trained model
     start_epoch = 0
@@ -89,7 +93,19 @@ def main(args):
             print(f'Restore training from epoch {start_epoch}.')
         except ValueError:
             pass
-    
+
+    # stage8: we build the batch sampler for paddle.DataLoader
+    train_sampler = DistributedBatchSampler(
+        train_ds, batch_size=args.batch_size, shuffle=True, drop_last=False)
+    train_loader = DataLoader(
+        train_ds,
+        batch_sampler=train_sampler,
+        num_workers=args.num_workers,
+        collate_fn=waveform_collate_fn,
+        return_list=True,
+        use_buffer_reader=True, )
+
+
 if __name__ == "__main__":
     # yapf: disable
     parser = argparse.ArgumentParser(__doc__)
@@ -105,10 +121,17 @@ if __name__ == "__main__":
                         type=float,
                         default=1e-8,
                         help="Learning rate used to train with warmup.")
-    parser.add_argument("--load_checkpoint", 
-                        type=str, 
-                        default=None, 
+    parser.add_argument("--load_checkpoint",
+                        type=str,
+                        default=None,
                         help="Directory to load model checkpoint to contiune trainning.")
+    parser.add_argument("--batch_size",
+                        type=int, default=64,
+                        help="Total examples' number in batch for training.")
+    parser.add_argument("--num_workers",
+                        type=int,
+                        default=0,
+                        help="Number of workers in dataloader.")
 
     args = parser.parse_args()
     # yapf: enable

paddlespeech/vector/datasets/batch.py

@@ -0,0 +1,20 @@
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# 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.
+
+
+def waveform_collate_fn(batch):
+    waveforms = np.stack([item['feat'] for item in batch])
+    labels = np.stack([item['label'] for item in batch])
+
+    return {'waveforms': waveforms, 'labels': labels}