Revert "add the amp decorator"

This reverts commit d3b7690f21.

ppcls/utils/amp.py

@@ -1,32 +0,0 @@
-import functools
-import paddle
-
-
-def AMP_forward_decorator(func):
-    @functools.wraps(func)
-    def wrapper(model, *args, **kwargs):
-        if AMPForwardDecorator.amp_level:
-            with paddle.amp.auto_cast(
-                    custom_black_list={
-                        "flatten_contiguous_range", "greater_than"
-                    },
-                    level=AMPForwardDecorator.amp_level):
-                return func(model, *args, **kwargs)
-        else:
-            return func(model, *args, **kwargs)
-
-    return wrapper
-
-
-class AMPForwardDecorator(object):
-    amp_level = None
-    amp_eval = None
-
-    def __init__(self, forward_func):
-        self.forward_func = forward_func
-
-    @functools.wraps
-    def __call__(self, model_obj, *args, **kwargs):
-        # print(type(self))
-        # print(type(model_obj))
-        return self.forward_func(model_obj, *args, **kwargs)