Attempt to make w2v play with DDP AND checkpointing

codes/models/asr/w2v_wrapper.py

@@ -16,11 +16,34 @@ def only_letters(string):
     return ''.join(filter(allowlist.__contains__, string.upper()))
 
 
+class Wav2VecFeatureExtractor(nn.Module):
+    """
+    Basic wrapper that only does feature extraction. Useful to build out this portion of the model so it can be
+    operated through DDP.
+    """
+    def __init__(self, basis_model='facebook/wav2vec2-large'):
+        super().__init__()
+        w2v = Wav2Vec2ForCTC.from_pretrained(basis_model)
+        self.extractor = w2v.wav2vec2.feature_extractor
+
+        for p in self.extractor.parameters():
+            p.requires_grad = False
+            p.DO_NOT_TRAIN = True
+
+    def forward(self, audio, wav_lengths):
+        with torch.no_grad():
+            audio = audio[:, :, :wav_lengths.max()]
+            audio_norm = (audio - audio.mean()) / torch.sqrt(audio.var() + 1e-7)
+            return self.extractor(audio_norm.squeeze(1))
+
+
 class Wav2VecWrapper(nn.Module):
     """
     Basic wrapper class that makes Wav2Vec2 usable by DLAS.
     """
-    def __init__(self, vocab_size=148, basis_model='facebook/wav2vec2-large', freeze_transformer=False, output_wer=True, checkpointing_enabled=True, provide_attention_mask=False, spec_augment=True):
+    def __init__(self, vocab_size=148, basis_model='facebook/wav2vec2-large', freeze_transformer=False, output_wer=True,
+                 checkpointing_enabled=True, provide_attention_mask=False, spec_augment=True,
+                 remove_feature_extractor=False):
         super().__init__()
         self.provide_attention_mask = provide_attention_mask
         
@@ -32,11 +55,17 @@ class Wav2VecWrapper(nn.Module):
         self.w2v.config.pad_token_id = 0
         self.w2v.config.ctc_loss_reduction = 'sum'
         self.w2v.config.apply_spec_augment = spec_augment
+        self.remove_feature_extractor = remove_feature_extractor
 
+        if remove_feature_extractor:
+            # The values passed in to the w2v model in this case are the outputs of the feature extractor.
+            self.w2v.wav2vec2.feature_extractor = nn.Identity()
+        else:
             # We always freeze the feature extractor, which needs some special operations in DLAS
             for p in self.w2v.wav2vec2.feature_extractor.parameters():
                 p.requires_grad = False
                 p.DO_NOT_TRAIN = True
+
         if freeze_transformer:
             # Also freeze the encoder here.
             for p in list(self.w2v.wav2vec2.encoder.parameters()) + list(self.w2v.wav2vec2.feature_projection.parameters()):
@@ -48,19 +77,19 @@ class Wav2VecWrapper(nn.Module):
             self.last_pred = []
             self.last_labels = []
 
-    def forward(self, audio, unaligned_tokens, wav_lengths, text_lengths):
-        audio = audio[:, :, :wav_lengths.max()]
+    def forward(self, audio, unaligned_tokens, wav_lengths, text_lengths, fea_extractor=None):
         unaligned_tokens = unaligned_tokens[:, :text_lengths.max()]
+        audio = audio[:, :, :wav_lengths.max()]
         attention_mask = torch.ones_like(audio).squeeze(1)
+        audio = (audio - audio.mean()) / torch.sqrt(audio.var() + 1e-7)
+        audio = audio.squeeze(1)  # Get rid of the channels; w2v re-adds them.
         for b in range(audio.shape[0]):
+            if self.provide_attention_mask:
                 attention_mask[b, wav_lengths[b]:] = 0
             unaligned_tokens[b, text_lengths[b]:] = -100
 
-        audio_norm = (audio - audio.mean()) / torch.sqrt(audio.var() + 1e-7)
-        if self.provide_attention_mask:
-            outputs = self.w2v(input_values=audio_norm.squeeze(1), attention_mask=attention_mask, labels=unaligned_tokens)
-        else:
-            outputs = self.w2v(input_values=audio_norm.squeeze(1), labels=unaligned_tokens)
+        model_inp = fea_extractor if self.remove_feature_extractor else audio
+        outputs = self.w2v(input_values=model_inp, attention_mask=attention_mask, labels=unaligned_tokens)
 
         if self.output_wer:
             self.last_pred.append(torch.argmax(outputs.logits, dim=-1))
@@ -101,6 +130,11 @@ class Wav2VecWrapper(nn.Module):
         return [self.decode_ctc(p) for p in pred]
 
 
+@register_model
+def register_wav2vec_feature_extractor(opt_net, opt):
+    return Wav2VecFeatureExtractor(**opt_get(opt_net, ['kwargs'], {}))
+
+
 @register_model
 def register_wav2vec2_finetune(opt_net, opt):
     return Wav2VecWrapper(**opt_get(opt_net, ['kwargs'], {}))
@@ -108,8 +142,10 @@ def register_wav2vec2_finetune(opt_net, opt):
 
 if __name__ == '__main__':
     print(only_letters("Hello, world!"))
-    w2v = Wav2VecWrapper(basis_model='facebook/wav2vec2-large-960h', freeze_transformer=True)
-    loss = w2v(torch.randn(2,1,50000), torch.randint(0,40,(2,70)), torch.tensor([20000, 30000]), torch.tensor([35, 50]))
+    fe = Wav2VecFeatureExtractor(basis_model='facebook/wav2vec2-large-960h')
+    w2v = Wav2VecWrapper(basis_model='facebook/wav2vec2-large-960h', freeze_transformer=True, remove_feature_extractor=True)
+    fea = fe(torch.randn(2,1,50000), torch.tensor([20000, 30000]))
+    loss = w2v(torch.randn(2,1,50000), torch.randint(0,40,(2,70)), torch.tensor([20000, 30000]), torch.tensor([35, 50]), fea)
     w2v.get_debug_values(0,"")
 
     sd = torch.load('../experiments/train_wav2vec_mass_archived_r0/models/19500_wav2vec.pth')