code: def is_pydata_spmatrix(m):
      """
      Check whether object is pydata/sparse matrix, avoiding importing the module.
      """
      base_cls = getattr(sys.modules.get("sparse"), "SparseArray", None)
      return base_cls is not None and isinstance(m, base_cls)
  
imports: import sys
  import operator
  import warnings
  import numpy
  from scipy._lib._util import prod
label_desc: Use image node_id 19 for calling a global function with example usage: is_pydata_spmatrix(m) and returns: unknown