class_docstr: This similarity function performs a dot product between a vector of weights and some
  combination of the two input vectors, followed by an (optional) activation function.  The
  combination used is configurable.
  
  If the two vectors are ``x`` and ``y``, we allow the following kinds of combinations: ``x``,
  ``y``, ``x*y``, ``x+y``, ``x-y``, ``x/y``, where each of those binary operations is performed
  elementwise.  You can list as many combinations as you want, comma separated.  For example, you
  might give ``x,y,x*y`` as the ``combination`` parameter to this class.  The computed similarity
  function would then be ``w^T [x; y; x*y] + b``, where ``w`` is a vector of weights, ``b`` is a
  bias parameter, and ``[;]`` is vector concatenation.
  
  Note that if you want a bilinear similarity function with a diagonal weight matrix W, where the
  similarity function is computed as `x * w * y + b` (with `w` the diagonal of `W`), you can
  accomplish that with this class by using "x*y" for `combination`.
  
  Parameters
  ----------
  tensor_1_dim : ``int``
      The dimension of the first tensor, ``x``, described above.  This is ``x.size()[-1]`` - the
      length of the vector that will go into the similarity computation.  We need this so we can
      build weight vectors correctly.
  tensor_2_dim : ``int``
      The dimension of the second tensor, ``y``, described above.  This is ``y.size()[-1]`` - the
      length of the vector that will go into the similarity computation.  We need this so we can
      build weight vectors correctly.
  combination : ``str``, optional (default="x,y")
      Described above.
  activation : ``Activation``, optional (default=linear (i.e. no activation))
      An activation function applied after the ``w^T * [x;y] + b`` calculation.  Default is no
      activation.
code: def reset_parameters(self):
      std = math.sqrt(6 / (self._weight_vector.size(0) + 1))
      self._weight_vector.data.uniform_(-std, std)
      self._bias.data.fill_(0)
  
file_path: magnitude/pymagnitude/third_party/allennlp/modules/similarity_functions/linear.py
imports: from __future__ import division
  from __future__ import absolute_import
  import math
  import torch
  from torch.nn.parameter import Parameter
  from allennlp.modules.similarity_functions.similarity_function import SimilarityFunction
  from allennlp.nn import Activation, util
label_desc: Use image node_id 2 for calling the LinearSimilarity obj's underlying member method code with example usage: obj.reset_parameters() without return types