无法从联机资源下载已保存的模型，pickle错误

import hashlib

def verify_file(file_path, expected_hash):
    sha256_hash = hashlib.sha256()
    with open(file_path, "rb") as f:
        for byte_block in iter(lambda: f.read(4096), b""):
            sha256_hash.update(byte_block)
    return sha256_hash.hexdigest() == expected_hash

from joblib import load

model = load('path_to_model.joblib')

import os

if not os.path.isfile('path_to_model.pkl'):
    print("File does not exist.")

import pickle

try:
    with open('model.pkl', 'rb') as file:
        model = pickle.load(file)
except pickle.UnpicklingError as e:
    print(f"Error loading model: {e}")
except FileNotFoundError:
    print("Model file not found.")