code: def test_maybe_methods():
      model = Linear(5)
      assert model.maybe_get_dim("nI") is None
      model.set_dim("nI", 4)
      assert model.maybe_get_dim("nI") == 4
      assert model.maybe_get_ref("boo") is None
      assert model.maybe_get_param("W") is None
      model.initialize()
      assert model.maybe_get_param("W") is not None
  
imports: import threading
  import time
  from collections import Counter
  import numpy
  import pytest
  from thinc.api import Adam, CupyOps, Dropout, Linear, Model, Relu, Shim, Softmax, chain, change_attr_values, concatenate, set_dropout_rate, use_ops, with_debug, wrap_model_recursive
  from thinc.compat import has_cupy_gpu
  from ..util import make_tempdir
label_desc: Use image node_id 11 for calling a global function with example usage: test_maybe_methods() without return types