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mindspore.ops.triplet_margin_loss

mindspore.ops.triplet_margin_loss(anchor, positive, negative, margin=1.0, p=2, eps=1e-06, swap=False, reduction='mean')

TripletMarginLoss operation. See mindspore.nn.TripletMarginLoss for details.

Parameters

• anchor (Tensor) – A sample randomly selected from the training set. Data type must be BasicType.

• positive (Tensor) – A sample belonging to the same category as anchor, with the same type and shape as anchor.

• negative (Tensor) – A sample belonging to the different class from anchor, with the same type and shape as anchor.

• margin (float, optional) – Make a margin between the positive pair and the negative pair. Default: 1.0 .

• p (int, optional) – The degree of norm for pairwise distance. Default: 2 .

• eps (float, optional) – Add small value to avoid division by zero. Default: 1e-06.

• swap (bool, optional) – The distance swap change the negative distance to the distance between positive sample and negative sample. Default: False .

• reduction (str, optional) –

  Apply specific reduction method to the output: 'none' , 'mean' , 'sum' . Default: 'mean' .

  • 'none': no reduction will be applied.

  • 'mean': compute and return the mean of elements in the output.

  • 'sum': the output elements will be summed.

Returns

Tensor. If reduction is "none", its shape is $(N)$. Otherwise, a scalar value will be returned.

Raises

• TypeError – If anchor or positive or negative is not a Tensor.

• TypeError – If dtype of anchor, positive and negative is not the same.

• TypeError – If margin is not a float.

• TypeError – If p is not an int.

• TypeError – If eps is not a float.

• TypeError – If swap is not a bool.

• ValueError – If dimensions of input anchor, positive and negative are less than or equal to 1 at the same time.

• ValueError – If the dimension of input anchor or positive or negative is bigger than or equal to 8.

• ValueError – If shape of anchor, positive and negative cannot broadcast.

• ValueError – If reduction is not one of 'none', 'mean', 'sum'.

Supported Platforms:

GPU

Examples

>>> import mindspore
>>> import numpy as np
>>> from mindspore import Tensor, ops
>>> anchor = Tensor(np.array([[0.3, 0.7], [0.5, 0.5]]), mindspore.float32)
>>> positive = Tensor(np.array([[0.4, 0.6], [0.4, 0.6]]), mindspore.float32)
>>> negative = Tensor(np.array([[0.2, 0.9], [0.3, 0.7]]), mindspore.float32)
>>> output = ops.triplet_margin_loss(anchor, positive, negative)
>>> print(output)
0.8881968