<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def plugin(cls):
 """Tag a class as a plugin. This decorator is required to make the class methods discoverable by the plugin_load method of the host. """

    cls._nvim_plugin = True
    # the _nvim_bind attribute is set to True by default, meaning that
    # decorated functions have a bound Nvim instance as first argument.
    # For methods in a plugin-decorated class this is not required, because
    # the class initializer will already receive the nvim object.
    predicate = lambda fn: hasattr(fn, '_nvim_bind')
    for _, fn in inspect.getmembers(cls, predicate):
        if IS_PYTHON3:
            fn._nvim_bind = False
        else:
            fn.im_func._nvim_bind = False
    return cls