update docstring in dilated_convolution_2d.py
@@ -14,9 +14,9 @@ class DilatedConvolution2D(link.Link):
function and holds the filter weight and bias vector as parameters.
Args:
- in_channels (int): Number of channels of input arrays. If ``None``,
- parameter initialization will be deferred until the first forward
- data pass at which time the size will be determined.
+ in_channels (int or None): Number of channels of input arrays.
+ If ``None``, parameter initialization will be deferred until the
+ first forward data pass at which time the size will be determined.
out_channels (int): Number of channels of output arrays.
ksize (int or pair of ints): Size of filters (a.k.a. kernels).
``ksize=k`` and ``ksize=(k, k)`` are equivalent.
