[CodeStyle][py2] remove paddle.compat (#47269)

* [CodeStyle][py2] remove `paddle.compat`

* remove compat from `paddle.__init__`

* enable_static in sample code

* Revert "enable_static in sample code"

This reverts commit ffccaa6.

* enable_static in sample code

python/paddle/__init__.py

@@ -61,7 +61,6 @@
     from .framework import VarBase as Tensor  # noqa: F401
 
 Tensor.__qualname__ = 'Tensor'  # noqa: F401
-import paddle.compat  # noqa: F401
 import paddle.distributed  # noqa: F401
 import paddle.sysconfig  # noqa: F401
 import paddle.distribution  # noqa: F401

python/paddle/fluid/backward.py

@@ -20,7 +20,6 @@
 import collections
 import copy
 import logging
-from .. import compat as cpt
 from . import unique_name
 from . import log_helper
 import paddle.fluid

python/paddle/fluid/core.py

@@ -44,8 +44,6 @@
             os.add_dll_directory(third_lib_path)
 
 except ImportError as e:
-    from .. import compat as cpt
-
     if os.name == 'nt':
         executable_path = os.path.abspath(os.path.dirname(sys.executable))
         raise ImportError(
@@ -71,8 +69,6 @@ def avx_supported():
     """
     Whether current system(Linux, MacOS, Windows) is supported with AVX.
     """
-    from .. import compat as cpt
-
     sysstr = platform.system().lower()
     has_avx = False
     if sysstr == 'linux':

python/paddle/fluid/dygraph/io.py

@@ -17,7 +17,6 @@
 import numpy as np
 
 import paddle
-from paddle import compat as cpt
 from paddle.fluid import core
 from paddle.fluid import framework
 from paddle.fluid import backward

python/paddle/fluid/framework.py

@@ -28,7 +28,6 @@
 import multiprocessing
 import sys
 import logging
-from .. import compat as cpt
 from .proto import framework_pb2
 
 from . import core

python/paddle/fluid/layers/control_flow.py

@@ -48,7 +48,6 @@
     check_type,
     check_dtype,
 )
-from ... import compat as cpt
 from ..backward import _infer_var_data_type_shape_
 from paddle import _C_ops, _legacy_C_ops
 

python/paddle/fluid/layers/detection.py

@@ -26,7 +26,6 @@
 from . import tensor
 from . import nn
 from . import ops
-from ... import compat as cpt
 from ..data_feeder import check_variable_and_dtype, check_type, check_dtype
 import math
 import numpy as np

python/paddle/fluid/optimizer.py

@@ -60,7 +60,6 @@
 from functools import reduce
 from functools import cmp_to_key
 from .wrapped_decorator import signature_safe_contextmanager
-from .. import compat as cpt
 import warnings
 from paddle import _C_ops, _legacy_C_ops
 from ..fluid.framework import (
@@ -6933,9 +6932,10 @@ def load(self, state_dict):
         Examples:
             .. code-block:: python
 
+                import paddle
                 import paddle.fluid as fluid
-                import paddle.compat as cpt
 
+                paddle.enable_static()
                 def mlp(input_x, input_y, hid_dim=128, label_dim=2):
                     fc_1 = fluid.layers.fc(input=input_x, size=hid_dim)
                     prediction = fluid.layers.fc(input=[fc_1], size=label_dim, act='softmax')
@@ -6955,7 +6955,7 @@ def mlp(input_x, input_y, hid_dim=128, label_dim=2):
                     state_dict = {}
                     sgd.load(state_dict)
                 except NotImplementedError as e:
-                    print(cpt.get_exception_message(e))
+                    print(e)
         """
         raise NotImplementedError(
             "load function is not supported by Recompute Optimizer for now"

python/paddle/fluid/tests/unittests/mlu/test_collective_api_base_mlu.py

@@ -89,7 +89,6 @@ def runtime_main(test_class, col_type):
     model.run_trainer(args)
 
 
-import paddle.compat as cpt
 import socket
 from contextlib import closing
 

python/paddle/fluid/tests/unittests/mlu/test_collective_base_mlu.py

@@ -163,7 +163,6 @@ def runtime_main(test_class):
     model.run_trainer(args)
 
 
-import paddle.compat as cpt
 import socket
 from contextlib import closing
 

python/paddle/fluid/tests/unittests/mlu/test_fill_constant_batch_size_like_op_mlu.py

@@ -18,7 +18,6 @@
 import paddle
 import paddle.fluid.core as core
 from paddle.static import program_guard, Program
-import paddle.compat as cpt
 import unittest
 import numpy as np
 from op_test import OpTest

python/paddle/fluid/tests/unittests/mlu/test_sync_batch_norm_base_mlu.py

@@ -434,7 +434,6 @@ def runtime_main(test_class, col_type, sub_type):
     model.run_trainer(args)
 
 
-import paddle.compat as cpt
 import socket
 from contextlib import closing
 

python/paddle/fluid/tests/unittests/npu/test_collective_base_npu.py

@@ -138,7 +138,6 @@ def runtime_main(test_class, col_type, sub_type):
     model.run_trainer(args)
 
 
-import paddle.compat as cpt
 import socket
 from contextlib import closing
 

python/paddle/fluid/tests/unittests/npu/test_sync_batch_norm_base_npu.py

@@ -451,7 +451,6 @@ def runtime_main(test_class, col_type, sub_type):
     model.run_trainer(args)
 
 
-import paddle.compat as cpt
 import socket
 from contextlib import closing