def conv(self, input, kernel, biases, k_h, k_w, c_o, s_h, s_w, padding="VALID", group=1):
'''From https://github.com/ethereon/caffe-tensorflow
'''
c_i = input.get_shape()[-1]
assert c_i%group==0
assert c_o%group==0
convolve = lambda i, k: tf.nn.conv2d(i, k, [1, s_h, s_w, 1], padding=padding)
if group==1:
conv = convolve(input, kernel)
else:
#input_groups = tf.split(3, group, input)
#kernel_groups = tf.split(3, group, kernel)
input_groups = tf.split(input, group, 3)
kernel_groups = tf.split(kernel, group, 3)
output_groups = [convolve(i, k) for i,k in zip(input_groups, kernel_groups)]
#conv = tf.concat(3, output_groups)
conv = tf.concat(output_groups, 3)
return tf.reshape(tf.nn.bias_add(conv, biases), [-1]+conv.get_shape().as_list()[1:])
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