docstr: Test causal LM model with `past_key_values`
docstr_tok: ["Test","causal","LM","model","with","`","past_key_values","`"]
code: def test_causal_lm_model_past(self):
      """Test causal LM model with `past_key_values`"""
      config_and_inputs = self.model_tester.prepare_config_and_inputs()
      self.model_tester.create_and_check_causal_lm_model_past(
          *config_and_inputs
      )
  
imports: import unittest
  from transformers import RemBertConfig, is_tf_available
  from transformers.testing_utils import require_tf, slow
  from ...test_configuration_common import ConfigTester
  from ...test_modeling_tf_common import TFModelTesterMixin, floats_tensor, ids_tensor, random_attention_mask
label_desc: Use image node_id 9 for calling the TFRemBertModelTest obj's underlying member method code with example usage: obj.test_causal_lm_model_past() without return types