update docstring in liner.py
@@ -21,9 +21,9 @@ class Linear(link.Link):
does not hold a bias vector.
Args:
- in_size (int): Dimension of input vectors. If ``None``, parameter
- initialization will be deferred until the first forward data pass
- at which time the size will be determined.
+ in_size (int or None): Dimension of input vectors. If ``None``,
+ parameter initialization will be deferred until the first forward
+ data pass at which time the size will be determined.
out_size (int): Dimension of output vectors.
wscale (float): Scaling factor of the weight matrix.
bias (float): Initial bias value.
