U dW @sHddlmZddlmZddlmZGdddeZGdd d eZd S) )Module) functional)TensorcsdeZdZUdZdddgZeed<eed<eed<deeedd fd d Ze e e d d dZ Z S)PairwiseDistancea Computes the pairwise distance between vectors :math:`v_1`, :math:`v_2` using the p-norm: .. math :: \Vert x \Vert _p = \left( \sum_{i=1}^n \vert x_i \vert ^ p \right) ^ {1/p}. Args: p (real): the norm degree. Default: 2 eps (float, optional): Small value to avoid division by zero. Default: 1e-6 keepdim (bool, optional): Determines whether or not to keep the vector dimension. Default: False Shape: - Input1: :math:`(N, D)` or :math:`(D)` where `N = batch dimension` and `D = vector dimension` - Input2: :math:`(N, D)` or :math:`(D)`, same shape as the Input1 - Output: :math:`(N)` or :math:`()` based on input dimension. If :attr:`keepdim` is ``True``, then :math:`(N, 1)` or :math:`(1)` based on input dimension. Examples:: >>> pdist = nn.PairwiseDistance(p=2) >>> input1 = torch.randn(100, 128) >>> input2 = torch.randn(100, 128) >>> output = pdist(input1, input2) normepskeepdim@ư>FN)pr r returncs$tt|||_||_||_dSN)superr__init__rr r )selfr r r  __class__=/tmp/pip-unpacked-wheel-ua33x9lu/torch/nn/modules/distance.pyr$szPairwiseDistance.__init__x1x2rcCst|||j|j|jSr)FZpairwise_distancerr r rrrrrrforward*szPairwiseDistance.forward)r r F) __name__ __module__ __qualname____doc__ __constants__float__annotations__boolrrr __classcell__rrrrrs  rcsXeZdZUdZddgZeed<eed<d eeddfdd Ze e e d d d Z Z S)CosineSimilarityaReturns cosine similarity between :math:`x_1` and :math:`x_2`, computed along `dim`. .. math :: \text{similarity} = \dfrac{x_1 \cdot x_2}{\max(\Vert x_1 \Vert _2 \cdot \Vert x_2 \Vert _2, \epsilon)}. Args: dim (int, optional): Dimension where cosine similarity is computed. Default: 1 eps (float, optional): Small value to avoid division by zero. Default: 1e-8 Shape: - Input1: :math:`(\ast_1, D, \ast_2)` where D is at position `dim` - Input2: :math:`(\ast_1, D, \ast_2)`, same number of dimensions as x1, matching x1 size at dimension `dim`, and broadcastable with x1 at other dimensions. - Output: :math:`(\ast_1, \ast_2)` Examples:: >>> input1 = torch.randn(100, 128) >>> input2 = torch.randn(100, 128) >>> cos = nn.CosineSimilarity(dim=1, eps=1e-6) >>> output = cos(input1, input2) dimr r:0yE>N)r'r rcstt|||_||_dSr)rr&rr'r )rr'r rrrrGszCosineSimilarity.__init__rcCst|||j|jSr)rZcosine_similarityr'r rrrrrLszCosineSimilarity.forward)rr() rrrr r!intr#r"rrrr%rrrrr&.s r&N) modulerrrZtorchrrr&rrrrs   '