code: def test_get_used_tokens_for_llm():
      class MockTokenizer:
          pad_token_id = 0
  
      tokenizer = MockTokenizer()
      model_inputs = torch.tensor([1, 2, 3, 0, 0])
  
      assert get_used_tokens_for_llm(model_inputs, tokenizer) == 3
  
imports: import torch
  from ludwig.accounting.used_tokens import get_used_tokens_for_ecd, get_used_tokens_for_gbm, get_used_tokens_for_llm
label_desc: Use image node_id 4 for calling a global function with example usage: test_get_used_tokens_for_llm() without return types