The problem is: I only can see the output calculate by cpu, if I switch using device_type mps, it can run ok, but I cannot see the output, when I
pprint(memory.load_memory_variables({}))
there are many characters like this:

 'AI: \x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'            '\x1c'

My environment is this:
CPU and GPU: Apple M1 16G
Python version: Python 3.11.4
llama-cpp-python == 0.1.78

I have tried to only run llama without langchain, the mps is run ok, and can output string, mps fast than cpu.
So I don't know the problem is langchain or somewhat, and I don't know how to fix this, I really don't wanna use cpu, it's slow and make my Mac very hot.