def _vec(x):
    'Stacks column of matrix to form a single column.'
    return array_ops.reshape(array_ops.matrix_transpose(x), array_ops.concat([array_ops.shape(x)[:(- 2)], [(- 1)]], axis=0))
Stacks column of matrix to form a single column.
def _vec(x):
    
    return array_ops.reshape(array_ops.matrix_transpose(x), array_ops.concat([array_ops.shape(x)[:(- 2)], [(- 1)]], axis=0))