It seems fluid is absent from paddlepaddle after 2.5, causing issue with backend detection on Windows

[Robert-Lu]

Environment

OS: Windows 10
python=3.8 (also tried on 3.10)
parl=2.2.1
paddlepaddle-gpu==2.6.0

Related Code

PARL/parl/utils/utils.py

Line 76 in 3bb5fe3

from paddle import fluid

def check_installed_framework_in_windows():
    global _HAS_FLUID, _HAS_PADDLE, _HAS_TORCH
    # paddle & fluid
    try:
        _HAS_FLUID = False
        _HAS_PADDLE = False
        import paddle
        from paddle import fluid

        paddle_version = get_fluid_version()
        logger.info("paddlepaddle version: {}.".format(paddle.__version__))
        if paddle_version < 200 and paddle_version != 0:
            assert paddle_version >= 185, "PARL requires paddle >= 1.8.5 and paddle < 2.0.0"
            _HAS_FLUID = True
        else:
            _HAS_PADDLE = True
    except ImportError as e:
        _HAS_FLUID = False
        _HAS_PADDLE = False
...
...

The logic above caused _HAS_PADDLE set to False even with the latest paddle installed. According to this post, quotes:

从飞桨框架 2.5 版本开始，我们已经废弃了 paddle.fluid namespace 下的 API，请使用其他的替代 API。

Remedy

I changed the parl/utils/utils.py as temporary remedy.

def check_installed_framework_in_windows():
    global _HAS_FLUID, _HAS_PADDLE, _HAS_TORCH
    # paddle & fluid
    try:
        _HAS_FLUID = False
        _HAS_PADDLE = False
        import paddle
        from paddle import fluid

        paddle_version = get_fluid_version()
        logger.info("paddlepaddle version: {}.".format(paddle.__version__))
        if paddle_version < 200 and paddle_version != 0:
            assert paddle_version >= 185, "PARL requires paddle >= 1.8.5 and paddle < 2.0.0"
            _HAS_FLUID = True
        else:
            _HAS_PADDLE = True
    except ImportError as e:
        _HAS_FLUID = False
        try:
            import paddle
            _HAS_PADDLE = True
        except ImportError:
            _HAS_PADDLE = False
...
...

[KnightYin]

I just change code like this

# from paddle import fluid