why is the prompt not be learnable?

[yhao-z]

As in the code, the arg learnable_input_prompt is set to be False in default, and when i check the whole model PromptMR, i find that there is no learnable_input_prompt arg, which means that prompt is not learnable.

PromptMR/models/promptmr.py

Line 70 in 2db837a

def __init__(self, prompt_dim=128, prompt_len=5, prompt_size=96, lin_dim=192, learnable_input_prompt = False):

This really makes me confused. If the prompt is not learnable, so why it is called prompt? It just has nothing related to the distortion type, just a random noise by initialization. And, why it works as it is a pure noise?

I would really appreciate it if you or anyone else could help me to find it out