code: def test_str_map():
      amap = mxnet._ffi.convert_to_node({"a": 2, "b": 3})
      assert "a" in amap
      assert len(amap) == 2
      dd = dict(amap.items())
      assert "a" in dd
      assert "b" in dd
  
file_path: mxnet/tests/python/unittest/test_ffi_container.py
imports: import mxnet
  import numpy
  from mxnet import np, npx, _api_internal
  from mxnet.ndarray import NDArray
  from mxnet.test_utils import use_np
label_desc: Use image node_id 1 for calling a global function with example usage: test_str_map() without return types