remove channel code

pyha_analyzer/dataset.py

@@ -256,7 +256,7 @@ def to_image(self, audio):
 
         # Sigmoid to get 0 to 1 scaling (0.5 becomes mean)
         mel = torch.sigmoid(mel)
-        return mel.unsqueeze(0) #torch.stack([mel, mel, mel])
+        return torch.stack([mel, mel, mel])
 
     def __getitem__(self, index): #-> Any:
         """ Takes an index and returns tuple of spectrogram image with corresponding label