Tensorflow: Convolutions with different filter for each sample in the mini-batch

Question

I would like to have a 2d convolution with a filter which depends on the sample in the mini-batch in tensorflow. Any ideas how one could do that, especially if the number of

Answer 1

I think the proposed trick is actually not right. What happens with a tf.conv3d() layer is that the input gets convolved on depth (=actual batch) dimension AND then summed along resulting feature maps. With padding='SAME' the resulting number of outputs then happens to be the same as batch size so one gets fooled!

EDIT: I think a possible way to do a convolution with different filters for the different mini-batch elements involves 'hacking' a depthwise convolution. Assuming batch size MB is known:

inp = tf.placeholder(tf.float32, [MB, H, W, channels_img])

# F has shape (MB, fh, fw, channels, out_channels)
# REM: with the notation in the question, we need: channels_img==channels

F = tf.transpose(F, [1, 2, 0, 3, 4])
F = tf.reshape(F, [fh, fw, channels*MB, out_channels)

inp_r = tf.transpose(inp, [1, 2, 0, 3]) # shape (H, W, MB, channels_img)
inp_r = tf.reshape(inp, [1, H, W, MB*channels_img])

out = tf.nn.depthwise_conv2d(
          inp_r,
          filter=F,
          strides=[1, 1, 1, 1],
          padding='VALID') # here no requirement about padding being 'VALID', use whatever you want. 
# Now out shape is (1, H, W, MB*channels*out_channels)

out = tf.reshape(out, [H, W, MB, channels, out_channels) # careful about the order of depthwise conv out_channels!
out = tf.transpose(out, [2, 0, 1, 3, 4])
out = tf.reduce_sum(out, axis=3)

# out shape is now (MB, H, W, out_channels)

In case MB is unknown, it should be possible to determine it dynamically using tf.shape() (I think)