remove fold_const param

Signed-off-by: hwangdeyu <dejack953@outlook.com>

README.md

@@ -140,7 +140,6 @@ python -m tf2onnx.convert
     [--concrete_function CONCRETE_FUNCTION]
     [--target TARGET]
     [--custom-ops list-of-custom-ops]
-    [--fold_const]
     [--large_model]
     [--continue_on_error]
     [--verbose]
@@ -230,9 +229,6 @@ will be used.
 
 Some models require special handling to run on some runtimes. In particular, the model may use unsupported data types. Workarounds are activated with ```--target TARGET```. Currently supported values are listed on this [wiki](https://github.com/onnx/tensorflow-onnx/wiki/target). If your model will be run on Windows ML, you should specify the appropriate target value.
 
-#### --fold_const
-
-Deprecated. 
 
 ### <a name="summarize_graph"></a>Tool to get Graph Inputs & Outputs
 

Troubleshooting.md

@@ -33,6 +33,6 @@ The reason for this is that there is a dynamic input of a tensorflow op but the
 
 An example of this is the [ONNX Slice operator before opset-10](https://github.com/onnx/onnx/blob/master/docs/Changelog.md#Slice-1) - the start and end of the slice are static attributes that need to be known at graph creation. In tensorflow the [strided slice op](https://www.tensorflow.org/api_docs/cc/class/tensorflow/ops/strided-slice) allows dynamic inputs. tf2onnx will try to find the real value of begin and end of the slice and can find them in most cases. But if those are real dynamic values calculate at runtime it will result in the message ```get tensor value: ... must be Const```.
 
-You can pass the options ```--fold_const``` in the tf2onnx command line that allows tf2onnx to apply more aggressive constant folding which will increase chances to find a constant.
+You can pass the options ```--fold_const(deprecated after tf2onnx-1.9.3)``` in the tf2onnx command line that allows tf2onnx to apply more aggressive constant folding which will increase chances to find a constant.
 
 If this doesn't work the model is most likely not to be able to convert to ONNX. We used to see this a lot of issue with the ONNX Slice op and in opset-10 was updated for exactly this reason.

examples/rnn_tips.md

@@ -16,7 +16,7 @@ For other advanced RNN cells, it is supposed to good to convert as well, but the
 Use following commands to have a quick trial on your model:
 
 ```
-python -m tf2onnx.convert --input frozen_rnn_model.pb --inputs input1:0,input2:0 --outputs output1:0,output2:0 --fold_const --opset 8 --output target.onnx  --continue_on_error
+python -m tf2onnx.convert --input frozen_rnn_model.pb --inputs input1:0,input2:0 --outputs output1:0,output2:0 --opset 8 --output target.onnx  --continue_on_error
 ```
 
 ## Limitation
@@ -36,7 +36,7 @@ Use [onnxruntime](https://github.com/Microsoft/onnxruntime) or [caffe2](https://
 There is a simpler way to run your models and test its correctness (compared with TensorFlow run) using following command.
 
 ```
-python tests\run_pretrained_models.py --backend onnxruntime  --config rnn.yaml --tests model_name --fold_const --onnx-file ".\tmp" --opset 8
+python tests\run_pretrained_models.py --backend onnxruntime  --config rnn.yaml --tests model_name --onnx-file ".\tmp" --opset 8
 ```
 
 The content of rnn.yaml looks as below. For inputs, an explicit numpy expression or a shape can be used. If a shape is specified, the value will be randomly generated.

tests/backend_test_base.py

@@ -133,7 +133,7 @@ def assert_results_equal(self, expected, actual, rtol, atol, mtol=None,
             if check_shape:
                 self.assertEqual(expected_val.shape, actual_val.shape)
 
-    def freeze_and_run_tf(self, func, feed_dict, outputs, as_session, premade_placeholders, large_model, constant_fold):
+    def freeze_and_run_tf(self, func, feed_dict, outputs, as_session, premade_placeholders, large_model):
         np.random.seed(1)  # Make it reproducible.
         clean_feed_dict = {utils.node_name(k): v for k, v in feed_dict.items()}
         if is_tf2() and not as_session:
@@ -195,7 +195,7 @@ def freeze_and_run_tf(self, func, feed_dict, outputs, as_session, premade_placeh
             tf_reset_default_graph()
             with tf_session() as sess:
                 tf.import_graph_def(graph_def, name='')
-                graph_def = tf_optimize(list(feed_dict.keys()), outputs, graph_def, fold_constant=constant_fold)
+                graph_def = tf_optimize(list(feed_dict.keys()), outputs, graph_def)
 
         return result, graph_def, initialized_tables
 
@@ -331,8 +331,8 @@ def get_dtype(info):
             self.assertEqual(get_dtype(info), graph.get_dtype(info.name))
 
     def run_test_case(self, func, feed_dict, input_names_with_port, output_names_with_port,
-                      rtol=1e-07, atol=1e-5, mtol=None, convert_var_to_const=True, constant_fold=True,
-                      check_value=True, check_shape=True, check_dtype=True, process_args=None, onnx_feed_dict=None,
+                      rtol=1e-07, atol=1e-5, mtol=None, convert_var_to_const=True, check_value=True,
+                      check_shape=True, check_dtype=True, process_args=None, onnx_feed_dict=None,
                       graph_validator=None, as_session=False, large_model=False, premade_placeholders=False,
                       use_custom_ops=False, optimize=True):
         """
@@ -361,7 +361,7 @@ def run_test_case(self, func, feed_dict, input_names_with_port, output_names_wit
 
         expected, graph_def, initialized_tables = \
             self.freeze_and_run_tf(func, feed_dict, output_names_with_port, as_session,
-                                   premade_placeholders, large_model, constant_fold)
+                                   premade_placeholders, large_model)
 
         graph_def_path = os.path.join(self.test_data_directory, self._testMethodName + "_after_tf_optimize.pb")
         utils.save_protobuf(graph_def_path, graph_def)

tests/test_backend.py

@@ -174,7 +174,6 @@ def get_maxpoolwithargmax_getdata():
 class BackendTests(Tf2OnnxBackendTestBase):
     def _run_test_case(self, func, output_names_with_port, feed_dict, **kwargs):
         kwargs["convert_var_to_const"] = False
-        kwargs["constant_fold"] = False
         return self.run_test_case(func, feed_dict, [], output_names_with_port, **kwargs)
 
     def _test_expand_dims_known_rank(self, idx):
@@ -709,7 +708,7 @@ def func(x):
         feed_dict = {"input_1:0": x_val}
         input_names_with_port = ["input_1:0"]
         output_names_with_port = ["output:0"]
-        self.run_test_case(func, feed_dict, input_names_with_port, output_names_with_port, constant_fold=False,
+        self.run_test_case(func, feed_dict, input_names_with_port, output_names_with_port,
                            graph_validator=lambda g: (check_op_count(g, "RandomUniform", 0) and
                                                       check_op_count(g, "RandomUniformLike", 0)))
 
@@ -5229,7 +5228,7 @@ def func(query_holder):
             lookup_results = hash_table.lookup(query_holder)
             ret = tf.add(lookup_results, 0, name=_TFOUTPUT)
             return ret
-        self._run_test_case(func, [_OUTPUT], {_INPUT: query}, constant_fold=False, as_session=True)
+        self._run_test_case(func, [_OUTPUT], {_INPUT: query}, as_session=True)
         os.remove(filnm)
 
     @check_opset_min_version(8, "CategoryMapper")

tests/test_const_fold.py

@@ -16,7 +16,6 @@
 class ConstantFoldingTests(Tf2OnnxBackendTestBase):
     def _run_test_case(self, func, output_names_with_port, feed_dict, **kwargs):
         kwargs["convert_var_to_const"] = False
-        kwargs["constant_fold"] = False
         return self.run_test_case(func, feed_dict, [], output_names_with_port, **kwargs)
 
     def test_concat(self):

tests/test_string_ops.py

@@ -167,7 +167,7 @@ def func(text):
             return tokens_, begin_, end_, rows_
         # Fails due to Attempting to capture an EagerTensor without building a function.
         self._run_test_case(func, [_OUTPUT, _OUTPUT1, _OUTPUT2, _OUTPUT3],
-                            {_INPUT: text_val}, constant_fold=False, as_session=True)
+                            {_INPUT: text_val}, as_session=True)
 
 
 if __name__ == "__main__":

tests/test_tf_shape_inference.py

@@ -41,7 +41,7 @@ def _run_test_case(self, input_names_with_port, output_names_with_port):
         tf.import_graph_def(graph_def, name='')
 
         # optimize graph
-        graph_def = tf_optimize(input_names_with_port, output_names_with_port, sess.graph_def, True)
+        graph_def = tf_optimize(input_names_with_port, output_names_with_port, sess.graph_def)
 
         with tf_session() as sess:
             if self.config.is_debug_mode:

tf2onnx/convert.py

@@ -83,8 +83,7 @@ def get_args():
     parser.add_argument("--verbose", "-v", help="verbose output, option is additive", action="count")
     parser.add_argument("--debug", help="debug mode", action="store_true")
     parser.add_argument("--output_frozen_graph", help="output frozen tf graph to file")
-    parser.add_argument("--fold_const", help="Deprecated. Constant folding is always enabled.",
-                        action="store_true")
+
     # experimental
     parser.add_argument("--inputs-as-nchw", help="transpose inputs as from nhwc to nchw")
     args = parser.parse_args()
@@ -375,7 +374,7 @@ def _from_keras_tf1(model, input_signature=None, opset=None, custom_ops=None, cu
         frozen_graph, initialized_tables = tf_loader.freeze_session(sess, input_names, output_names, get_tables=True)
         with tf.Graph().as_default():
             tf.import_graph_def(frozen_graph, name="")
-            frozen_graph = tf_loader.tf_optimize(input_names, output_names, frozen_graph, False)
+            frozen_graph = tf_loader.tf_optimize(input_names, output_names, frozen_graph)
         model_proto, external_tensor_storage = _convert_common(
             frozen_graph,
             name=model.name,

tf2onnx/rewriter/random_uniform.py

@@ -39,7 +39,6 @@ def rewrite_random_uniform(g, ops):
     return ops
 
 
-# rewriter function when fold_const is enabled
 def rewrite_random_uniform_fold_const(g, ops):
     pattern = \
         OpTypePattern('Add', name='output', inputs=[

tf2onnx/tf_loader.py

@@ -673,15 +673,15 @@ def from_keras(model_path, input_names, output_names):
     return frozen_graph, input_names, output_names
 
 
-def tf_optimize_grappler(input_names, output_names, graph_def, fold_constant=None):
+def tf_optimize_grappler(input_names, output_names, graph_def):
     from tensorflow.core.protobuf import meta_graph_pb2 as meta_graph_pb2, config_pb2, rewriter_config_pb2
     from tensorflow.python.grappler import tf_optimizer as tf_opt
 
     config = config_pb2.ConfigProto()
     rewrite_options = config.graph_options.rewrite_options
     config.graph_options.infer_shapes = True
     # TODO: if we turn on pruning, grappler removes some identities that the tf-1.x lstm rewriter
-    # depends on so for now don't turn this on, fold_constant is always enabled now.
+    # depends on so for now don't turn this on, constfold is always enabled now.
     rewrite_options.optimizers[:] = [
         # 'pruning', 'constfold', 'arithmetic', 'dependency', 'function',
         'constfold', 'function'
@@ -700,7 +700,7 @@ def tf_optimize_grappler(input_names, output_names, graph_def, fold_constant=Non
     return graph_def
 
 
-def tf_optimize(input_names, output_names, graph_def, fold_constant=True):
+def tf_optimize(input_names, output_names, graph_def):
     """Extract inference subgraph and optimize graph."""
     assert isinstance(input_names, list)
     assert isinstance(output_names, list)
@@ -712,7 +712,7 @@ def tf_optimize(input_names, output_names, graph_def, fold_constant=True):
 
     want_grappler = is_tf2() or LooseVersion(tf.__version__) >= "1.15"
     if want_grappler:
-        graph_def = tf_optimize_grappler(input_names, output_names, graph_def, fold_constant)
+        graph_def = tf_optimize_grappler(input_names, output_names, graph_def)
     else:
         # the older transform path
         from tensorflow.tools.graph_transforms import TransformGraph  # pylint: disable=redefined-outer-name

tf2onnx/tfonnx.py

@@ -625,7 +625,7 @@ def compat_handler(ctx, node, **kwargs):
     return g
 
 
-def tf_optimize(input_names, output_names, graph_def, fold_constant=True):
+def tf_optimize(input_names, output_names, graph_def):
     """optimize tensorflow graph. This is in tf_loader but some apps call this
        so we proxy into tf_loader to keep them working."""
-    return tf2onnx.tf_loader.tf_optimize(input_names, output_names, graph_def, fold_constant)
+    return tf2onnx.tf_loader.tf_optimize(input_names, output_names, graph_def)