Render部署React+Python Web应用时Keras模型加载失败求助

大家好，我遇到了一个在Render上部署Python后端加载Keras模型的棘手问题，折腾了好一阵没找到根源，想请教下各位经验丰富的开发者：

问题背景 #

我有一个.keras格式的TensorFlow模型，在本地Python3.11的conda虚拟环境中运行完全正常，但部署到Render平台后，执行main.py加载模型时直接抛出错误。Render的默认Python版本也是3.11，环境版本完全匹配，但就是无法正常加载模型。

具体报错信息 #

Traceback (most recent call last):
  File "/opt/render/project/src/backend/main.py", line 32, in <module>
    model = tf.keras.models.load_model(MODEL_PATH)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_api.py", line 230, in load_model
    return saving_lib.load_model(
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_lib.py", line 275, in load_model
    raise e
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_lib.py", line 263, in load_model
    _load_state(
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_lib.py", line 456, in _load_state
    _load_container_state(
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_lib.py", line 513, in _load_container_state
    _load_state(
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/saving/saving_lib.py", line 425, in _load_state
    trackable.load_own_variables(weights_store.get(inner_path))
  File "/opt/render/project/src/.venv/lib/python3.11/site-packages/keras/src/engine/base_layer.py", line 3539, in load_own_variables
    raise ValueError(
ValueError: Layer 'conv2d' expected 2 variables, but received 0 variables during loading. Expected: ['conv2d/kernel:0', 'conv2d/bias:0']

已尝试的排查操作 #

• 本地删除项目文件夹，重新克隆Git仓库、初始化虚拟环境、重装依赖后运行main.py，依然能正常工作
• 确认本地和Render上的模型文件完全一致，没有被修改过
• 反复检查过Render上的模型文件路径是正确的
• 确认本地conda环境和Render的Python版本都是3.11，版本无差异

现在实在卡在这里找不到突破口了，有没有朋友遇到过类似的情况？或者能给我一些新的排查方向建议？

备注：内容来源于stack exchange，提问作者Nik Pierce