mindspore.mint.nn.functional.gelu

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mindspore.mint.nn.functional.gelu(input, approximate='none')[source]

Gaussian Error Linear Units activation function.

GeLU is described in the paper Gaussian Error Linear Units (GELUs). And also please refer to BERT: Pre-training of Deep Bidirectional Transformers for Language Understanding.

When approximate argument is none, GeLU is defined as follows:

\[GELU(x_i) = x_i*P(X < x_i),\]

where \(P\) is the cumulative distribution function of the standard Gaussian distribution, \(x_i\) is the input element.

When approximate argument is tanh, GeLU is estimated with:

\[GELU(x_i) = 0.5 * x_i * (1 + \tanh(\sqrt(2 / \pi) * (x_i + 0.044715 * x_i^3)))\]

GELU Activation Function Graph:

../../_images/GELU.png
Parameters

  • input (Tensor) – The input of the activation function GeLU, the data type is float16, float32 or float64.

  • approximate (str) – the gelu approximation algorithm to use. Acceptable vaslues are 'none' and 'tanh' . Default: 'none' .

Returns

Tensor, with the same type and shape as input.

Raises

  • TypeError – If input is not a Tensor.

  • TypeError – If dtype of input is not bfloat16, float16, float32 or float64.

  • ValueError – If approximate value is neither none nor tanh.

Supported Platforms:

Ascend

Examples

>>> import mindspore
>>> from mindspore import Tensor, mint
>>> x = Tensor([1.0, 2.0, 3.0], mindspore.float32)
>>> result = mint.nn.functional.gelu(x)
>>> print(result)
[0.8413447 1.9544997 2.9959505]