code: def nested_fill(m, n):
      mat = []
      directives.set_element_type(mat, tf.int32)
      for _ in range(m):
          l = []
          directives.set_element_type(l, tf.int32)
          for j in range(n):
              l.append(j)
          mat.append(special_functions.stack(l, strict=False))
      return special_functions.stack(mat, strict=False)
  
file_path: tensorflow/tensorflow/python/autograph/tests/basic_list_test.py
imports: import tensorflow
  from tensorflow.python.autograph.lang import directives
  from tensorflow.python.autograph.lang import special_functions
  from tensorflow.python.autograph.tests import reference_test_base
label_desc: Use image node_id 5 for calling a global function with example usage: nested_fill(m, n) and returns: special_functions