Comments (3)
It's because conv2d is used, so we need to add an extra 'dummy' dimension, as we only want to stride across one dimension.
An alternative could be to use conv1d but this does the same thing anyway (uses conv2d) and would mean tf would shape back and forth pointlessly in between convolutions.
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I was looking through the code of tf_util.conv2d, basically the input_image should be 4D tensor.
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Hi phoenixSP,
it's just a choice of implementation. You can also use conv1d (input will be 3D) or just batch matrix multiplication (input will be 2D) with a few more transformations.
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