ndarray 1D matrix multiplication #397

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derppening · 2024-04-23T10:31:12+08:00

derppening commented

2024-04-23 10:31:12 +08:00

The behavior depends on the arguments in the following way.

...

If the first argument is 1-D, it is promoted to a matrix by prepending a 1 to its dimensions. After matrix multiplication the prepended 1 is removed.

If the second argument is 1-D, it is promoted to a matrix by appending a 1 to its dimensions. After matrix multiplication the appended 1 is removed.

>>> np.identity(2) @ np.zeros((2))
array([0., 0.])
>>> np.zeros((2)) @ np.identity(2)
array([0., 0.])
>>> np.zeros((2)) @ np.zeros(2)
0.0

> The behavior depends on the arguments in the following way. > > ... > > - If the first argument is 1-D, it is promoted to a matrix by prepending a 1 to its dimensions. After matrix multiplication the prepended 1 is removed. > > - If the second argument is 1-D, it is promoted to a matrix by appending a 1 to its dimensions. After matrix multiplication the appended 1 is removed. ```py >>> np.identity(2) @ np.zeros((2)) array([0., 0.]) >>> np.zeros((2)) @ np.identity(2) array([0., 0.]) >>> np.zeros((2)) @ np.zeros(2) 0.0 ```

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2024-04-23 10:31:31 +08:00

ndarray: Implement 2D-2D matrix multiplication #398

lyken self-assigned this 2024-08-07 16:46:52 +08:00

lyken commented

2024-08-12 17:14:52 +08:00

Implemented in ndstrides, for general N-D tensors.

Implemented in `ndstrides`, for general N-D tensors.

lyken referenced this issue

2024-08-26 12:07:32 +08:00

NDArray with strides + NDArrayObject + Models + Exceptions in IRRT. #506

lyken referenced this issue