class_docstr: Class for matrix Lie groups.
docstr: Matrix identity.
docstr_tok: ["Matrix","identity","."]
code: def identity(self):
      """Matrix identity."""
      return gs.eye(self.representation_dim)
  
imports: import abc
  import geomstats.backend
  from geomstats.geometry.invariant_metric import InvariantMetric
  from geomstats.geometry.manifold import Manifold
  from geomstats.geometry.matrices import Matrices
label_desc: Use image node_id 2 for calling the MatrixLieGroup obj's underlying member method code with example usage: obj.identity() and returns: gs