calling pf_client.run inside the callable target function for evaluate got "Error: (AssertionError) daemonic processes are not allowed to have children."

[yanggaome]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

I am trying to hook up the evaluate method with my own prompt which used to run from pf_client.run

example code below:

from promptflow.client import PFClient

pf_client = PFClient()

def user_call():
    my_prompt_flow = pf_client.run(my prompt flow configs)
    return my_prompt_flow_output

def run_evaluation():
    results = evaluate(
                 evaluation_name=evaluation_name,
                 data=data_path,
                 target=user_call,
                 evaluators={
                    "violence": violence_evaluator,
                    "sexual": sex_evaluator,
                    "self_harm": self_harm_evaluator,
                    "hate_unfairnes": hate_unfairness_evaluator,
                    "content_safety": content_safety_evaluator
                 },
                azure_ai_project=project_scope
             )

Any log messages given by the failure

2024-07-06 00:58:41 +0000 1845174 execution.bulk INFO The process [1845174] has received a terminate signal.
2024-07-06 00:58:42 +0000 1844849 execution ERROR 1/1 flow run failed, indexes: [0], exception of index 0: Execution failure in 'user_call': (UnexpectedError) Unexpected error occurred while executing the batch run. Error: (AssertionError) daemonic processes are not allowed to have children.

Expected/desired behavior

OS and Version?

Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)
Linux

Versions

Mention any other details that might be useful

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