chainer.functions.reshape

chainer.functions.reshape(x, shape)[source]

Reshapes an input variable without copy.

Parameters:
  • x (Variable or N-dimensional array) – Input variable.
  • shape (tuple of int s) – Expected shape of the output array. The number of elements which the array of shape contains must be equal to that of input array. One shape dimension can be -1. In this case, the value is inferred from the length of the array and remaining dimensions.
Returns:

Variable that holds a reshaped version of the input variable.

Return type:

Variable

Example

>>> x = np.array([[1, 2, 3, 4], [5, 6, 7, 8]])
>>> y = F.reshape(x, (8,))
>>> y.shape
(8,)
>>> y.array
array([1, 2, 3, 4, 5, 6, 7, 8])
>>> y = F.reshape(x, (4, -1))  # the shape of output is inferred
>>> y.shape
(4, 2)
>>> y.array
array([[1, 2],
       [3, 4],
       [5, 6],
       [7, 8]])
>>> y = F.reshape(x, (4, 3))  # the shape of input and output are not consistent
Traceback (most recent call last):
...
chainer.utils.type_check.InvalidType:
Invalid operation is performed in: Reshape (Forward)

Expect: prod(in_types[0].shape) == prod((4, 3))
Actual: 8 != 12