The iterative planner returns empty string

[hadifar]

First of all thanks for your releasing the code.

I'm trying to play with the planner module. However, I'm not able to generate plans using lumos_complex_qa_plan_iterative.
I already used the lumos_complex_qa_plan_onetime and it did work perfectly.

Here is the code:

from transformers import pipeline
import transformers
import torch

model_id = "ai2lumos/lumos_complex_qa_plan_iterative"
# works--> ai2lumos/lumos_complex_qa_plan_onetime

pipeline = transformers.pipeline(
    "text-generation",
    model=model_id,
    model_kwargs={"torch_dtype": torch.bfloat16},
    device_map="auto",
)

print("-"*50)
print("-"*50)
q_list = [
      "What year did Guns N Roses perform a promo for a movie starring Arnold Schwarzenegger as a former New York Police detective?"
]

for q in q_list:
        messages = 	[{ "role": "user", "content": f"Please provide a reasonable subgoal-based plan to solve the given task.\nTask: {q}; Initial Environment Description: None." } ]
        outputs = pipeline(
            messages,
            max_new_tokens=512,
        )
        print(outputs)

Do you know by chance how can I fix the issue?