Pipeline tutorial, summarization doesn't work

🤗Transformers
2

Yeah. It’s real version incompatibility between Transformers v4 and v5.

If go with v5, try without pipeline:

from transformers import AutoTokenizer, AutoModelForSeq2SeqLM

model_id = "google-t5/t5-small"   # or your finetuned summarization checkpoint
tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForSeq2SeqLM.from_pretrained(model_id)

inputs = tokenizer(
    "summarize: " + text,
    return_tensors="pt",
    truncation=True
).input_ids

outputs = model.generate(inputs, max_new_tokens=100, do_sample=False)
summary = tokenizer.decode(outputs[0], skip_special_tokens=True)
print(summary)

Or try another supported pipeline:

from transformers import pipeline

summarizer = pipeline("text-generation", model="Qwen/Qwen3-4B-Instruct-2507")

messages = [
    {
        "role": "user",
        "content": "Summarize the following text in 3 bullet points:\n\n" + text
    }
]

out = summarizer(messages, max_new_tokens=200)
print(out[0]["generated_text"][-1]["content"])