code: def ismatrix(m):
      """Check whether `m` is a 2D `numpy.ndarray` or `scipy.sparse` matrix.
  
      Parameters
      ----------
      m : object
          Object to check.
  
      Returns
      -------
      bool
          Is `m` a 2D `numpy.ndarray` or `scipy.sparse` matrix.
  
      """
      return (
          isinstance(m, np.ndarray)
          and m.ndim == 2
          or scipy.sparse.issparse(m)
      )
  
imports: from __future__ import with_statement
  import logging
  import math
  from gensim import utils
  import numpy
  import scipy.sparse
  from scipy.stats import entropy
  from scipy.linalg import get_blas_funcs, triu
  from scipy.linalg.lapack import get_lapack_funcs
  from scipy.special import psi
label_desc: Use image node_id 6 for calling a global function with example usage: ismatrix(m) and returns: unknown