mindspore.train.Top1CategoricalAccuracy

class mindspore.train.Top1CategoricalAccuracy[source]

Calculates the top-1 categorical accuracy. This class is a specialized class for TopKCategoricalAccuracy. Refer to mindspore.train.TopKCategoricalAccuracy for more details.

Supported Platforms:: Ascend GPU CPU

Examples

>>> import numpy as np
>>> from mindspore import Tensor
>>> from mindspore.train import Top1CategoricalAccuracy
>>>
>>> x = Tensor(np.array([[0.2, 0.5, 0.3, 0.6, 0.2], [0.1, 0.35, 0.5, 0.2, 0.],
...         [0.9, 0.6, 0.2, 0.01, 0.3]]), mindspore.float32)
>>> y = Tensor(np.array([2, 0, 1]), mindspore.float32)
>>> topk = Top1CategoricalAccuracy()
>>> topk.clear()
>>> topk.update(x, y)
>>> output = topk.eval()
>>> print(output)
0.0