Error caused by using tl.layers.DeformableConv2d function

[Liang-yc]

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Issue Description

An Error caused when using tl.layers.DeformableConv2d.

Reproducible Code

• Which OS are you using ?
  Windows 7 x64
• Please provide a reproducible code of your issue. Without any reproducible code, you will probably not receive any help.

net = tl.layers.InputLayer(x, name='input_layer')
offset1 = tl.layers.Conv2d(net, 18, (3, 3), (1, 1), act=act, padding='SAME', name='offset1')
net = tl.layers.DeformableConv2d(net, offset1, 32, (3, 3), act=act, name='deformable1')
offset2 = tl.layers.Conv2d(net, 18, (3, 3), (1, 1), act=act, padding='SAME', name='offset2')
net = tl.layers.DeformableConv2d(net, offset2, 64, (3, 3), act=act, name='deformable2')

When I used this code provided by Tensorlayer API documents, a TypeError was caused. I found a mistake in convolution.py. And I suggest you delete Line 971 in convolution.py or do something to fix this error.

[2wins]

As @Liang-yc said, it works well after removing Line 971

[DEKHTIARJonathan]

Alright, I managed to reproduce the problem and I have added a unittest relative to this issue: #573

This seems like a simple fix, I will try to merge today. You will be able to install TL from master.