[BUG] Could not use model in custom dir on Win10 with cli command

[Mikachu2333]

Sum

I decide to use u2net_human_seg.onnx on my custom dir with Python embedded (in order to make a portable package) and meet problem.

To Reproduce

Steps to reproduce the behavior:

1. Download python embedded via https://www.python.org/ftp/python/3.12.3/python-3.12.3-embed-amd64.zip
2. Unzip the file and go to the dir
3. Replace the python312._pth file's line 5 from #import site to import site
4. Download get-pip.py and use python.exe in dir to run it. (A folder will be create as the rusult which located near python.exe in the dir named Scripts)
5. Use pip.exe in Scripts dir to install rembg
6. Download u2net_human_seg.onnx and place it to the Scripts dir
7. Open powershell in Scripts dir and run the command as follow

Command1 (Error)

Use relative path.

./rembg.exe i -m u2net_custom -x '{"model_path": "./u2net_human_seg.onnx"}' "123.jpg" "123_u.jpg"

Command2 (Error)

Use absolute path.

./rembg.exe i -m u2net_custom -x '{"model_path": "D:\\Temp\\rembg-embedded\\python-3.12.3-embed-amd64\\Scripts\\u2net_human_seg.onnx"}' "123.jpg" "123_u.jpg"

Command3 (Error)

Change quotation marks

1

./rembg.exe i -m u2net_custom -x "{"model_path": "./u2net_human_seg.onnx"}" "123.jpg" "123_u.jpg"

2

./rembg.exe i -m u2net_custom -x "{model_path: ./u2net_human_seg.onnx}" "123.jpg" "123_u.jpg"

3

./rembg.exe i -m u2net_custom -x "{'model_path': './u2net_human_seg.onnx'}" "123.jpg" "123_u.jpg"

Command3 (Error)

Use equal sign

1

./rembg.exe i -m u2net_custom -x "{"model_path"="./u2net_human_seg.onnx"}" "123.jpg" "123_u.jpg"

2

./rembg.exe i -m u2net_custom -x="{"model_path": "./u2net_human_seg.onnx"}" "123.jpg" "123_u.jpg"

Error msg

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Scripts\rembg.exe\__main__.py", line 4, in <module>
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\rembg\cli.py", line 16, in <module>
    _main()
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\click\core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\click\core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\click\core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\click\core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\click\core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\rembg\commands\i_command.py", line 108, in i_command
    output.write(remove(input.read(), session=new_session(model, **kwargs), **kwargs))
                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\rembg\session_factory.py", line 44, in new_session
    return session_class(model_name, sess_opts, providers, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "D:\Temp\rembg-embedded\python-3.12.3-embed-amd64\Lib\site-packages\rembg\sessions\u2net_custom.py", line 43, in __init__
    raise ValueError("model_path is required")

Expected behavior

Run successfully without any error.

System and Python info

Windows 10, 22H2, 19045.4291

Python 3.12.3 (embedded)

Rembg version

v2.0.57 (latest)

Additional info

1. I tried #629 and what readme.md support to do but nothing happened.
2. I insert code in u2net_custom.py , line 37 (after comments) to show kwargs and args, and, I see nothing about model_path as if this kwarg has been delete when program transform the args info.

Code:

        for v in args:#testonly
            print ('Optional argument (args): ', v)
        for k, v in kwargs.items():#testonly
            print ('Optional argument %s (kwargs): %s' % (k, v))

Show:

Optional argument alpha_matting (kwargs): False
Optional argument alpha_matting_foreground_threshold (kwargs): 240
Optional argument alpha_matting_background_threshold (kwargs): 10
Optional argument alpha_matting_erode_size (kwargs): 10
Optional argument only_mask (kwargs): False
Optional argument post_process_mask (kwargs): False
Optional argument bgcolor (kwargs): (0, 0, 0, 0)

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