```CODE: 
# prepare the model input
prompt = "Give me a brief explanation of gravity in simple terms."
messages_think = [
    {"role": "user", "content": prompt}
]

text = tokenizer.apply_chat_template(
    messages_think,
    tokenize=False,
    add_generation_prompt=True,
)
model_inputs = tokenizer([text], return_tensors="pt").to(model.device)

# Generate the output
generated_ids = model.generate(**model_inputs, max_new_tokens=32768)

# Get and decode the output
output_ids = generated_ids[0][len(model_inputs.input_ids[0]) :]
print(tokenizer.decode(output_ids, skip_special_tokens=True))
```

ERROR: 
Traceback (most recent call last):
  File "/tmp/HuggingFaceTB_SmolLM3-3B_4nbUwLr.py", line 22, in <module>
    text = tokenizer.apply_chat_template(
           ^^^^^^^^^
NameError: name 'tokenizer' is not defined