Add static_only decorator for static apis (#29015)

* add static_only for static api

* addd static_only for class init

* remove static_only for default_main_program

* remove creater_parameter & startup_program

* remove failed apis

* revert py_func import

* remove global scope

* remove some api

* remove cuda pinned place

python/paddle/fluid/backward.py

@@ -1272,6 +1272,7 @@ def _get_no_grad_set_name(no_grad_set):
     return no_grad_set_name
 
 
+@framework.static_only
 def append_backward(loss,
                     parameter_list=None,
                     no_grad_set=None,
@@ -1861,6 +1862,7 @@ def calc_gradient(targets, inputs, target_gradients=None, no_grad_set=None):
         return grad_vars
 
 
+@framework.static_only
 def gradients(targets, inputs, target_gradients=None, no_grad_set=None):
     """
     :api_attr: Static Graph

python/paddle/fluid/framework.py

@@ -229,7 +229,7 @@ def _dygraph_only_(func):
 def _static_only_(func):
     def __impl__(*args, **kwargs):
         assert not in_dygraph_mode(
-        ), "We only support '%s()' in static graph mode, please call 'paddle.enable_static()' to enter static graph mode." % func.__name__
+        ), "In PaddlePaddle 2.x, we turn on dynamic graph mode by default, and '%s()' is only supported in static graph mode. So if you want to use this api, please call 'paddle.enable_static()' before this api to enter static graph mode." % func.__name__
         return func(*args, **kwargs)
 
     return __impl__

python/paddle/fluid/input.py

@@ -14,7 +14,7 @@
 
 from __future__ import print_function
 import warnings
-from .framework import Variable, in_dygraph_mode
+from .framework import Variable, in_dygraph_mode, static_only
 from .layer_helper import LayerHelper
 from .data_feeder import check_variable_and_dtype, check_dtype
 from ..utils import deprecated
@@ -129,6 +129,7 @@ def one_hot(input, depth, allow_out_of_range=False):
     return one_hot_out
 
 
+@static_only
 @deprecated(since='2.0.0', update_to='paddle.nn.functional.embedding')
 def embedding(input,
               size,

python/paddle/fluid/io.py

@@ -30,7 +30,7 @@ from paddle.fluid import layers
 from paddle.fluid.executor import Executor, global_scope
 from paddle.fluid.evaluator import Evaluator
 from paddle.fluid.framework import Program, Parameter, default_main_program, default_startup_program, Variable, \
-    program_guard, dygraph_not_support
+    program_guard, dygraph_not_support, static_only
 from paddle.reader import cache, map_readers, buffered, compose, chain, shuffle, \
     ComposeNotAligned, firstn, xmap_readers, multiprocess_reader
 from .wrapped_decorator import signature_safe_contextmanager
@@ -1710,7 +1710,7 @@ def _load_persistable_nodes(executor, dirname, graph):
     load_vars(executor=executor, dirname=dirname, vars=var_list)
 
 
-@dygraph_not_support
+@static_only
 def save(program, model_path):
     """
     :api_attr: Static Graph
@@ -1773,7 +1773,7 @@ def save(program, model_path):
         f.write(program.desc.serialize_to_string())
 
 
-@dygraph_not_support
+@static_only
 def load(program, model_path, executor=None, var_list=None):
     """
     :api_attr: Static Graph
@@ -2107,7 +2107,7 @@ def load_program_state(model_path, var_list=None):
     return para_dict
 
 
-@dygraph_not_support
+@static_only
 def set_program_state(program, state_dict):
     """
     :api_attr: Static Graph

python/paddle/fluid/layers/control_flow.py

@@ -18,7 +18,7 @@ from ..wrapped_decorator import signature_safe_contextmanager
 from .layer_function_generator import autodoc, templatedoc
 from .tensor import assign, cast, fill_constant
 from .. import core
-from ..framework import Program, Variable, Operator, in_dygraph_mode
+from ..framework import Program, Variable, Operator, in_dygraph_mode, static_only
 from ..layer_helper import LayerHelper, unique_name
 from .nn import logical_and, logical_not, logical_or
 from .utils import assert_same_structure, map_structure, hold_mutable_vars, copy_mutable_vars
@@ -211,6 +211,7 @@ def merge_lod_tensor(in_true, in_false, x, mask, level=0):
     return out
 
 
+@static_only
 def Print(input,
           first_n=-1,
           message=None,

python/paddle/fluid/layers/detection.py

@@ -20,7 +20,7 @@ from __future__ import print_function
 from .layer_function_generator import generate_layer_fn
 from .layer_function_generator import autodoc, templatedoc
 from ..layer_helper import LayerHelper
-from ..framework import Variable, in_dygraph_mode
+from ..framework import Variable, in_dygraph_mode, static_only
 from .. import core
 from .loss import softmax_with_cross_entropy
 from . import tensor
@@ -2099,6 +2099,7 @@ def density_prior_box(input,
     return box, var
 
 
+@static_only
 def multi_box_head(inputs,
                    image,
                    base_size,

python/paddle/fluid/layers/loss.py

@@ -20,7 +20,7 @@ from paddle.utils import deprecated
 from . import nn
 from .layer_function_generator import templatedoc
 from ..layer_helper import LayerHelper
-from ..framework import Variable, in_dygraph_mode
+from ..framework import Variable, in_dygraph_mode, static_only
 from .. import core
 from ..data_feeder import check_variable_and_dtype, check_type
 from ..param_attr import ParamAttr
@@ -664,6 +664,7 @@ def warpctc(input,
 # FIXME(wuyi): let docstring_checker.py understand @autodoc.
 # For now, the comments in c++ use types like Tensor, but in python side
 # the type is often "Variable", and arguments may vary.
+@static_only
 @templatedoc(op_type="nce")
 def nce(input,
         label,

python/paddle/fluid/layers/nn.py

@@ -26,7 +26,7 @@ import six
 import paddle
 from ..layer_helper import LayerHelper
 from ..initializer import Normal, Constant, NumpyArrayInitializer
-from ..framework import Variable, OpProtoHolder, in_dygraph_mode, dygraph_only, _dygraph_tracer, default_main_program, _varbase_creator
+from ..framework import Variable, OpProtoHolder, in_dygraph_mode, dygraph_only, _dygraph_tracer, default_main_program, _varbase_creator, static_only
 from .. import dygraph_utils
 from ..param_attr import ParamAttr
 from .layer_function_generator import autodoc, templatedoc, _generate_doc_string_
@@ -3216,6 +3216,7 @@ def instance_norm(input,
     return instance_norm_out
 
 
+@static_only
 def data_norm(input,
               act=None,
               epsilon=1e-05,
@@ -13465,6 +13466,7 @@ class PyFuncRegistry(object):
         return tuple(ret)
 
 
+@static_only
 @templatedoc()
 def py_func(func, x, out, backward_func=None, skip_vars_in_backward_input=None):
     """

python/paddle/fluid/parallel_executor.py

@@ -28,7 +28,7 @@ BuildStrategy = core.ParallelExecutor.BuildStrategy
 
 class ParallelExecutor(object):
     """
-	:api_attr: Static Graph
+	:api_attr: Static Graph
 
     The ParallelExecutor is an upgraded version of :code:`paddle.static.Executor` that supports multi-node model
     training and testing based on the data-parallel mode. In data-parallel mode,

python/paddle/static/__init__.py

@@ -19,12 +19,13 @@ __all__ = [
     'name_scope', 'ParallelExecutor', 'program_guard', 'WeightNormParamAttr',
     'default_main_program', 'default_startup_program', 'Program', 'data',
     'InputSpec', 'save', 'load', 'save_inference_model', 'load_inference_model',
-    'load_program_state', 'set_program_state', 'cpu_places', 'cuda_places', 'Variable'
+    'load_program_state', 'set_program_state', 'cpu_places', 'cuda_places',
+    'Variable'
 ]
 
 from . import nn
-from .io import save_inference_model #DEFINE_ALIAS
-from .io import load_inference_model #DEFINE_ALIAS
+from .io import save_inference_model  #DEFINE_ALIAS
+from .io import load_inference_model  #DEFINE_ALIAS
 from ..fluid import Scope  #DEFINE_ALIAS
 from .input import data  #DEFINE_ALIAS
 from .input import InputSpec  #DEFINE_ALIAS