class_docstr: Class for the space of complex matrices (m, n).
  
  Parameters
  ----------
  m, n : int
      Integers representing the shapes of the matrices: m x n.
docstr: Metric to equip the space with if equip is True.
docstr_tok: ["Metric","to","equip","the","space","with","if","equip","is","True","."]
code: def default_metric():
      """Metric to equip the space with if equip is True."""
      return ComplexMatricesMetric
  
imports: import geomstats.backend
  import geomstats.errors
  from geomstats.geometry.base import ComplexMatrixVectorSpace
  from geomstats.geometry.hermitian import HermitianMetric
  from geomstats.geometry.matrices import Matrices
  from geomstats.vectorization import repeat_out
label_desc: Use image node_id 2 for calling the ComplexMatrices obj's underlying member method code with example usage: obj.default_metric() and returns: ComplexMatricesMetric