dotelos opened a new issue #9872: A bug in an example in the python API document URL: https://github.com/apache/incubator-mxnet/issues/9872 This is an example found in the doc for [mxnet.autograd.Function](https://mxnet.incubator.apache.org/api/python/autograd.html#mxnet.autograd.Function). ```python class sigmoid(Function): def forward(self, x): y = 1 / (1 + mx.nd.exp(-x)) self.save_for_backward(y) return y def backward(self, dy): # backward takes as many inputs as forward's return value, # and returns as many NDArrays as forward's arguments. y, = self.saved_tensors return y * (1-y) ``` The `backward` method should return `dy * y * (1-y)` instead of `y * (1-y)` according to the chain rule.
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