how to obtain the runtime batch size of a Keras model

Question

Based on this post. I need some basic implementation help. Below you see my model using a Dropout layer. When using the noise_shape parameter, it happens that the last batch

Answer 1

The current implementation does adjust the according to the runtime batch size. From the Dropout layer implementation code:

symbolic_shape = K.shape(inputs)
noise_shape = [symbolic_shape[axis] if shape is None else shape
               for axis, shape in enumerate(self.noise_shape)]

So if you give noise_shape=(None, 1, features) the shape will be (runtime_batchsize, 1, features) following the code above.