[Bug]: examples/conversation_in_stream_mode/main.py stream_ollama failed, stream_ds OK

[liaoweiguo]

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Describe the bug

conversation_in_stream_mode when use config stream_ollama,

File "/Users/xxxx/work/agent/conversationinstream.py", line 114, in
msg = agent(msg)
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/agents/agent.py", line 135, in call
res = self.reply(*args, **kwargs)
File "/Users/xxxx/work/agent/conversationinstream.py", line 90, in reply
self.speak(res.stream)
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/agents/agent.py", line 174, in speak
for last, text_chunk in content:
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/models/response.py", line 95, in _stream_generator_wrapper
for text in self._stream:
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/models/ollama_model.py", line 213, in generator
self._save_model_invocation_and_update_monitor(
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/models/ollama_model.py", line 258, in _save_model_invocation_and_update_monitor
self._save_model_invocation(
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/models/model.py", line 379, in _save_model_invocation
FileManager.get_instance().save_api_invocation(
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/site-packages/agentscope/manager/_file.py", line 185, in save_api_invocation
json.dump(record, file, indent=4, ensure_ascii=False)
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/json/init.py", line 179, in dump
for chunk in iterable:
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/json/encoder.py", line 431, in _iterencode
yield from _iterencode_dict(o, _current_indent_level)
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/json/encoder.py", line 405, in _iterencode_dict
yield from chunks
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/json/encoder.py", line 438, in _iterencode
o = _default(o)
File "/Users/xxxx/miniconda3/envs/agentscope/lib/python3.9/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.class.name} '
TypeError: Object of type ChatResponse is not JSON serializable

To Reproduce
Steps to reproduce the behavior:

change

YOUR_SELECTED_MODEL_CONFIG_NAME = "stream_ds"

to

YOUR_SELECTED_MODEL_CONFIG_NAME = "stream_ollama"

and run main.py

Expected behavior
A clear and concise description of what you expected to happen.

Error messages

TypeError: Object of type ChatResponse is not JSON serializable

Environment (please complete the following information):

• AgentScope Version: [e.g. 0.0.2 via print(agentscope.__version__)]
• Python Version: [e.g. 3.9]
• OS: [e.g. macos, windows]

Additional context
Add any other context about the problem here.