Text Generation output keep repeat input sentences. Am I missing somethings

[illnino]

I use gpt2 train them by some dataset save it to local model.
When I use it its keep repeating the input

import torch
from transformers import pipeline

generator = pipeline(
    "text-generation", 
    model="./boba", 
    torch_dtype=torch.bfloat16, 
    device_map="auto"
    )
outputs = generator(
    "Hello, I'm a language model,", 
    max_length=30, 
    num_return_sequences=5,
    repetition_penalty=2.0
    )

for o in outputs:
    print(o)

print("\n")