code: def as_dense(arr):
      if arr.stype != "default":
          return mx.nd.cast_storage(arr, stype="default")
      else:
          return arr
  
imports: from mxnet.test_utils import *
  from mxnet.base import MXNetError
  import pytest
  from common import assertRaises
  import random
  import warnings
label_desc: Use image node_id 13 for calling a global function with example usage: as_dense(arr) and returns: mx, arr