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From GitBox <...@apache.org>
Subject [GitHub] [singa] nudles commented on a change in pull request #662: CUDNN LSTM
Date Sat, 11 Apr 2020 13:38:32 GMT
nudles commented on a change in pull request #662: CUDNN LSTM
URL: https://github.com/apache/singa/pull/662#discussion_r407064129
 
 

 ##########
 File path: python/singa/autograd.py
 ##########
 @@ -3330,6 +3330,94 @@ def step_forward(self, x, h, c, Wx, Wh, Bx, Bh):
         return hout, cout
 
 
+class _RNN(Operation):
+    """ RNN operation with c++ backend
+    """
+    def __init__(self, handle):
+        assert singa.USE_CUDA is True, "Not able to run without CUDA"
+        super(_RNN, self).__init__()
+        self.handle = handle
+
+    def forward(self, x, W):
+        # TODO: CPU forward
+
+        # GPU forward
+        if training:
+            y = singa.GpuRNNForwardTraining(x, W, self.handle)
+            self.inputs = (x, W, y)
+        else:
+            y = singa.GpuRNNForwardInference(x, W, self.handle)
+
+        return y
+
+    def backward(self, dy):
+        assert training is True and hasattr(
+            self, "inputs"), "Please set training as True before do BP. "
+
+        # TODO: CPU backward
+
+        # GPU backward
+        dx = singa.GpuRNNBackwardx(self.inputs[2], dy, self.inputs[1], self.handle)
+        dW = singa.GpuRNNBackwardW(self.inputs[0], self.inputs[2], self.handle)
+        return dx, dW
+
+class RNN_direct(Layer):
 
 Review comment:
   rename to RNN?

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