建议更新 `requirements.txt` 以移除过时的 `multiprocessing` 依赖

[524994432]

​问题描述

在 Python 3 环境下安装 CLAM 时，requirements.txt 中的 multiprocessing 依赖会导致安装失败。该依赖项在 PyPI 上指向仅兼容 Python 2 的旧包（最新版本为 2.6.2.1），其 setup.py 包含 Python 2 语法（如 print '...'），与 Python 3 不兼容。

---

​复现步骤

1. 在 Python 3.10 环境中运行：

   pip install -r requirements.txt

触发以下错误：
log
error: subprocess-exited-with-error
...
File "setup.py", line 94
print 'Macros:'
^^^^^^^^^^^^^^^
SyntaxError: Missing parentheses in call to 'print'
Collecting multiprocessing (from -r requirements.txt (line 2))
Downloading https://pypi.tuna.tsinghua.edu.cn/packages/b8/8a/38187040f36cec8f98968502992dca9b00cc5e88553e01884ba29cbe6aac/multiprocessing-2.6.2.1.tar.gz (108 kB)
Preparing metadata (setup.py): started
Preparing metadata (setup.py): finished with status 'error'
error: subprocess-exited-with-error

× python setup.py egg_info did not run successfully.
│ exit code: 1
╰─> [7 lines of output]
Traceback (most recent call last):
File "", line 2, in
File "", line 34, in
File "/tmp/pip-install-jo6e5xr6/multiprocessing_79170498316f487d8f78bcc5494d7822/setup.py", line 94
print 'Macros:'
^^^^^^^^^^^^^^^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

× Encountered error while generating package metadata.
╰─> See above for output.