residual_no_bias (#46129)

* residual_no_bias

* comments

* more ut

* fix input

paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.cc

@@ -33,11 +33,16 @@ namespace ir {
 namespace patterns {
 
 struct PrelnResidualBias : public PatternBase {
-  PrelnResidualBias(PDPattern *pattern, const std::string &name_scope)
-      : PatternBase(pattern, name_scope, "preln_residual_bias") {}
+  PrelnResidualBias(PDPattern *pattern,
+                    const std::string &name_scope,
+                    bool with_bias)
+      : PatternBase(pattern, name_scope, "preln_residual_bias") {
+    with_bias_ = with_bias;
+  }
 
   void operator()(PDNode *x, PDNode *y);
 
+  bool with_bias_;
   // declare operator node's name
   PATTERN_DECL_NODE(elementwise_bias);
   PATTERN_DECL_NODE(elementwise0);
@@ -55,32 +60,41 @@ struct PrelnResidualBias : public PatternBase {
 };
 
 void PrelnResidualBias::operator()(PDNode *x, PDNode *y) {
+  PDNode *elementwise0 = nullptr;
+  PDNode *elementwise_bias_var = nullptr;
+  PDNode *elementwise0_out_var = nullptr;
   // Create nodes for elementwise add op.
-  x->assert_is_op_input("elementwise_add");
-  y->assert_is_op_input("elementwise_add", "X");
-  auto *elementwise0 =
-      pattern->NewNode(elementwise0_repr())->assert_is_op("elementwise_add");
-  auto *elementwise_bias_var = pattern->NewNode(elementwise_bias_repr())
-                                   ->assert_is_op_input("elementwise_add", "Y")
-                                   ->assert_is_persistable_var();
-  auto *elementwise0_out_var = pattern->NewNode(elementwise0_out_repr())
-                                   ->assert_is_op_output("elementwise_add")
-                                   ->assert_is_op_input("elementwise_add")
-                                   ->assert_more([](Node *x) {
-                                     if (x->outputs.size() == 1) {
-                                       return true;
-                                     } else {
-                                       return false;
-                                     }
-                                   });
+  if (with_bias_) {
+    elementwise0 =
+        pattern->NewNode(elementwise0_repr())->assert_is_op("elementwise_add");
+    elementwise_bias_var = pattern->NewNode(elementwise_bias_repr())
+                               ->assert_is_op_input("elementwise_add", "Y")
+                               ->assert_is_persistable_var();
+    elementwise0_out_var = pattern->NewNode(elementwise0_out_repr())
+                               ->assert_is_op_output("elementwise_add")
+                               ->assert_is_op_input("elementwise_add")
+                               ->assert_more([](Node *x) {
+                                 if (x->outputs.size() == 1) {
+                                   return true;
+                                 } else {
+                                   return false;
+                                 }
+                               });
+  } else {
+    elementwise0_out_var = y;
+  }
+
   auto *elementwise1 =
       pattern->NewNode(elementwise1_repr())->assert_is_op("elementwise_add");
   auto *elementwise1_out_var = pattern->NewNode(elementwise1_out_repr())
-                                   ->assert_is_op_output("elementwise_add")
                                    ->assert_is_op_input("layer_norm", "X");
   // Add links for elementwise_add op.
-  elementwise0->LinksFrom({y, elementwise_bias_var})
-      .LinksTo({elementwise0_out_var});
+  if (with_bias_) {
+    elementwise0->LinksFrom({y, elementwise_bias_var})
+        .LinksTo({elementwise0_out_var});
+    elementwise1_out_var->assert_is_op_output("elementwise_add");
+  }
+
   elementwise1->LinksFrom({x, elementwise0_out_var})
       .LinksTo({elementwise1_out_var});
   // Create nodes for layer_norm op.
@@ -115,7 +129,8 @@ void PrelnResidualBias::operator()(PDNode *x, PDNode *y) {
 
 }  // namespace patterns
 
-void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
+int PrelnResidualBiasFusePass::ApplyPattern(ir::Graph *graph,
+                                            bool with_bias) const {
   PADDLE_ENFORCE_NOT_NULL(
       graph, platform::errors::PreconditionNotMet("graph should not be null."));
   FusePassBase::Init("preln_residual_bias_fuse", graph);
@@ -123,18 +138,32 @@ void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
   int found_subgraph_count = 0;
 
   GraphPatternDetector gpd;
-  auto *x = gpd.mutable_pattern()
-                ->NewNode("preln_residual_bias_fuse/x")
-                ->AsInput()
-                ->assert_is_op_input("elementwise_add")
-                ->assert_var_not_persistable();
-  auto *y = gpd.mutable_pattern()
-                ->NewNode("preln_residual_bias_fuse/y")
-                ->AsInput()
-                ->assert_is_op_input("elementwise_add", "X")
-                ->assert_var_not_persistable();
-  patterns::PrelnResidualBias fused_pattern(gpd.mutable_pattern(),
-                                            "preln_residual_bias_fuse");
+  PDNode *x = nullptr;
+  PDNode *y = nullptr;
+  if (with_bias) {
+    x = gpd.mutable_pattern()
+            ->NewNode("preln_residual_bias_fuse/x")
+            ->AsInput()
+            ->assert_is_op_input("elementwise_add")
+            ->assert_var_not_persistable();
+    y = gpd.mutable_pattern()
+            ->NewNode("preln_residual_bias_fuse/y")
+            ->AsInput()
+            ->assert_is_op_input("elementwise_add", "X")
+            ->assert_var_not_persistable();
+  } else {
+    x = gpd.mutable_pattern()
+            ->NewNode("preln_residual_bias_fuse/x")
+            ->AsInput()
+            ->assert_is_op_input("elementwise_add", "X");
+
+    y = gpd.mutable_pattern()
+            ->NewNode("preln_residual_bias_fuse/y")
+            ->AsInput()
+            ->assert_is_op_input("elementwise_add", "Y");
+  }
+  patterns::PrelnResidualBias fused_pattern(
+      gpd.mutable_pattern(), "preln_residual_bias_fuse", with_bias);
   fused_pattern(x, y);
 
   auto handler = [&](const GraphPatternDetector::subgraph_t &subgraph,
@@ -145,11 +174,19 @@ void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
     }
 
     VLOG(4) << "handle PrelnResidualBias fuse";
-    GET_IR_NODE_FROM_SUBGRAPH(
-        elementwise_bias, elementwise_bias, fused_pattern);
-    GET_IR_NODE_FROM_SUBGRAPH(elementwise0, elementwise0, fused_pattern);
-    GET_IR_NODE_FROM_SUBGRAPH(
-        elementwise0_out, elementwise0_out, fused_pattern);
+    Node *elementwise_bias = nullptr;
+    Node *elementwise0 = nullptr;
+    Node *elementwise0_out = nullptr;
+    if (with_bias) {
+      GET_IR_NODE_FROM_SUBGRAPH(
+          tmp_elementwise_bias, elementwise_bias, fused_pattern);
+      GET_IR_NODE_FROM_SUBGRAPH(tmp_elementwise0, elementwise0, fused_pattern);
+      GET_IR_NODE_FROM_SUBGRAPH(
+          tmp_elementwise0_out, elementwise0_out, fused_pattern);
+      elementwise_bias = tmp_elementwise_bias;
+      elementwise0 = tmp_elementwise0;
+      elementwise0_out = tmp_elementwise0_out;
+    }
     GET_IR_NODE_FROM_SUBGRAPH(elementwise1, elementwise1, fused_pattern);
     GET_IR_NODE_FROM_SUBGRAPH(
         elementwise1_out, elementwise1_out, fused_pattern);
@@ -185,7 +222,9 @@ void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
     new_desc.SetInput("Y", {subgraph.at(y)->Name()});
     new_desc.SetInput("Scale", {layer_norm_scale->Name()});
     new_desc.SetInput("Bias", {layer_norm_bias->Name()});
-    new_desc.SetInput("EleBias", {elementwise_bias->Name()});
+    if (with_bias) {
+      new_desc.SetInput("EleBias", {elementwise_bias->Name()});
+    }
     // outputs
     new_desc.SetOutput("Out_0", {layer_norm_out->Name()});
     new_desc.SetOutput("Out_1", {elementwise1_out->Name()});
@@ -194,16 +233,20 @@ void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
     new_desc.SetAttr("begin_norm_axis",
                      layer_norm->Op()->GetAttr("begin_norm_axis"));
     auto fused_node = graph->CreateOpNode(&new_desc);  // OpDesc will be copied.
-    del_node_set.insert(elementwise0);
+    if (with_bias) {
+      del_node_set.insert(elementwise0);
+      del_node_set.insert(elementwise0_out);
+    }
     del_node_set.insert(elementwise1);
-    del_node_set.insert(elementwise0_out);
     del_node_set.insert(layer_norm);
     del_node_set.insert(layer_norm_mean);
     del_node_set.insert(layer_norm_variance);
     GraphSafeRemoveNodes(graph, del_node_set);
     IR_NODE_LINK_TO(subgraph.at(x), fused_node);
     IR_NODE_LINK_TO(subgraph.at(y), fused_node);
-    IR_NODE_LINK_TO(elementwise_bias, fused_node);
+    if (with_bias) {
+      IR_NODE_LINK_TO(elementwise_bias, fused_node);
+    }
     IR_NODE_LINK_TO(layer_norm_scale, fused_node);
     IR_NODE_LINK_TO(layer_norm_bias, fused_node);
     IR_NODE_LINK_TO(fused_node, layer_norm_out);
@@ -212,6 +255,17 @@ void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
   };
 
   gpd(graph, handler);
+  return found_subgraph_count;
+}
+
+void PrelnResidualBiasFusePass::ApplyImpl(ir::Graph *graph) const {
+  PADDLE_ENFORCE_NOT_NULL(
+      graph, platform::errors::PreconditionNotMet("graph should not be null."));
+  FusePassBase::Init("preln_residual_bias_fuse", graph);
+
+  int found_subgraph_count = 0;
+  found_subgraph_count = ApplyPattern(graph, true);
+  found_subgraph_count += ApplyPattern(graph, false);
   AddStatis(found_subgraph_count);
 }
 

paddle/fluid/framework/ir/preln_residual_bias_fuse_pass.h

@@ -29,6 +29,16 @@ namespace ir {
 //        other_op4    layer_norm            other_op4  other_op3
 //                       |
 //                   other_op3
+//                                 or
+//
+//     |           |                            |            |
+// other_op1     other_op2                  other_op1    other_op2
+//     |           |              fuse           \          /
+//     |------elementwise_add      ->          preln_residual_bias
+//             |          |                        |      |
+//        other_op4    layer_norm            other_op4  other_op3
+//                       |
+//                   other_op3
 class Graph;
 
 class PrelnResidualBiasFusePass : public FusePassBase {
@@ -80,6 +90,7 @@ class PrelnResidualBiasFusePass : public FusePassBase {
 
  protected:
   void ApplyImpl(ir::Graph* graph) const override;
+  int ApplyPattern(ir::Graph* graph, bool with_bias) const;
 };
 
 }  // namespace ir

paddle/fluid/inference/tensorrt/convert/preln_residual_bias.cc

@@ -51,12 +51,15 @@ class PrelnResidualBiasOpConverter : public OpConverter {
     framework::DDim bias_dims, scale_dims, ele_bias_dims;
     auto* bias = get_persistable_data("Bias", &bias_dims);
     auto* scale = get_persistable_data("Scale", &scale_dims);
-    auto* ele_bias = get_persistable_data("EleBias", &ele_bias_dims);
+    auto const& vars = op_desc.Inputs(false);
+    bool has_bias = vars.find("EleBias") != vars.end();
+    float* ele_bias =
+        has_bias ? get_persistable_data("EleBias", &ele_bias_dims) : nullptr;
 
     int bias_size = phi::product(bias_dims);
 
     int scale_size = phi::product(scale_dims);
-    int ele_bias_size = phi::product(ele_bias_dims);
+    int ele_bias_size = has_bias ? phi::product(ele_bias_dims) : 0;
     float epsilon = PADDLE_GET_CONST(float, op_desc.GetAttr("epsilon"));
     bool with_fp16 = engine_->WithFp16() && !engine_->disable_trt_plugin_fp16();
     if (engine_->precision() == AnalysisConfig::Precision::kInt8) {
@@ -66,18 +69,22 @@ class PrelnResidualBiasOpConverter : public OpConverter {
     nvinfer1::ILayer* layer = nullptr;
     plugin::DynamicPluginTensorRT* plugin = nullptr;
     if (with_fp16) {
-      auto half_ele_bias_data = new half[ele_bias_size];
-      for (int i = 0; i < ele_bias_size; i++) {
-        half_ele_bias_data[i] = static_cast<half>(ele_bias[i]);
+      half* half_ele_bias_data = nullptr;
+      if (ele_bias_size > 0) {
+        half_ele_bias_data = new half[ele_bias_size];
+        for (int i = 0; i < ele_bias_size; i++) {
+          half_ele_bias_data[i] = static_cast<half>(ele_bias[i]);
+        }
       }
-      plugin = new plugin::PrelnResidualBiasPluginDynamic(bias,
-                                                          scale,
-                                                          half_ele_bias_data,
-                                                          bias_size,
-                                                          scale_size,
-                                                          ele_bias_size,
-                                                          epsilon,
-                                                          with_fp16);
+      plugin = new plugin::PrelnResidualBiasPluginDynamic(
+          bias,
+          scale,
+          ele_bias_size > 0 ? half_ele_bias_data : nullptr,
+          bias_size,
+          scale_size,
+          ele_bias_size,
+          epsilon,
+          with_fp16);
     } else {
       plugin = new plugin::PrelnResidualBiasPluginDynamic(bias,
                                                           scale,

paddle/fluid/inference/tensorrt/plugin/preln_residual_bias_plugin.cu

@@ -44,19 +44,22 @@ int PrelnResidualBiasPluginDynamic::initialize() TRT_NOEXCEPT {
              scale_.data(),
              scale_size_ * sizeof(float),
              cudaMemcpyHostToDevice);
-
-  if (with_fp16_) {
-    cudaMalloc(&ele_bias_gpu_, sizeof(half) * ele_bias_size_);
-    cudaMemcpy(ele_bias_gpu_,
-               fp16_ele_bias_.data(),
-               ele_bias_size_ * sizeof(half),
-               cudaMemcpyHostToDevice);
+  if (ele_bias_size_ > 0) {
+    if (with_fp16_) {
+      cudaMalloc(&ele_bias_gpu_, sizeof(half) * ele_bias_size_);
+      cudaMemcpy(ele_bias_gpu_,
+                 fp16_ele_bias_.data(),
+                 ele_bias_size_ * sizeof(half),
+                 cudaMemcpyHostToDevice);
+    } else {
+      cudaMalloc(&ele_bias_gpu_, sizeof(float) * ele_bias_size_);
+      cudaMemcpy(ele_bias_gpu_,
+                 fp32_ele_bias_.data(),
+                 ele_bias_size_ * sizeof(float),
+                 cudaMemcpyHostToDevice);
+    }
   } else {
-    cudaMalloc(&ele_bias_gpu_, sizeof(float) * ele_bias_size_);
-    cudaMemcpy(ele_bias_gpu_,
-               fp32_ele_bias_.data(),
-               ele_bias_size_ * sizeof(float),
-               cudaMemcpyHostToDevice);
+    ele_bias_gpu_ = nullptr;
   }
 
   return 0;

python/paddle/fluid/tests/unittests/CMakeLists.txt

@@ -142,6 +142,7 @@ if(WIN32)
   list(REMOVE_ITEM TEST_OPS test_complex_matmul)
   list(REMOVE_ITEM TEST_OPS test_ops_nms)
   list(REMOVE_ITEM TEST_OPS test_trt_convert_preln_residual_bias)
+  list(REMOVE_ITEM TEST_OPS test_trt_convert_preln_residual_no_bias)
   list(REMOVE_ITEM TEST_OPS test_fused_multi_transformer_int8_op)
 endif()
 list(REMOVE_ITEM TEST_OPS test_checkpoint_saver)

python/paddle/fluid/tests/unittests/ir/inference/CMakeLists.txt

@@ -22,6 +22,10 @@ if(NOT WITH_DISTRIBUTE)
        "test_trt_convert_preln_residual_bias")
   list(REMOVE_ITEM TEST_TRT_IR_PASSES "test_trt_convert_preln_residual_bias")
   list(REMOVE_ITEM TEST_TRT_CONVERTER "test_trt_convert_preln_residual_bias")
+  list(REMOVE_ITEM TEST_INFERENCE_IR_PASSES
+       "test_trt_convert_preln_residual_no_bias")
+  list(REMOVE_ITEM TEST_TRT_IR_PASSES "test_trt_convert_preln_residual_no_bias")
+  list(REMOVE_ITEM TEST_TRT_CONVERTER "test_trt_convert_preln_residual_no_bias")
 
   list(REMOVE_ITEM TEST_INFERENCE_IR_PASSES "test_trt_convert_c_allreduce")
   list(REMOVE_ITEM TEST_TRT_IR_PASSES "test_trt_convert_c_allreduce")

python/paddle/fluid/tests/unittests/ir/inference/test_trt_convert_preln_residual_no_bias.py

+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from trt_layer_auto_scan_test import TrtLayerAutoScanTest, SkipReasons
+from program_config import TensorConfig, ProgramConfig
+import numpy as np
+import paddle.inference as paddle_infer
+from functools import partial
+from typing import Optional, List, Callable, Dict, Any, Set
+import unittest
+
+
+class TrtConvertSkipLayernormTest(TrtLayerAutoScanTest):
+
+    def is_program_valid(self, program_config: ProgramConfig) -> bool:
+        inputs = program_config.inputs
+        weights = program_config.weights
+        outputs = program_config.outputs
+
+        attrs = [
+            program_config.ops[i].attrs for i in range(len(program_config.ops))
+        ]
+
+        #The input dimension should be less than or equal to the set axis.
+        if 'begin_norm_axis' in attrs[0] and attrs[0]['begin_norm_axis'] >= 0:
+            if len(inputs['inputX_data'].shape) <= attrs[0]['begin_norm_axis']:
+                return False
+        return True
+
+    def sample_program_configs(self):
+
+        def generate_input1(attrs: List[Dict[str, Any]], batch):
+            return np.ones([batch, 128, 768]).astype(np.float32)
+
+        def generate_input2(attrs: List[Dict[str, Any]], batch):
+            return np.ones([batch, 128, 768]).astype(np.float32)
+
+        def generate_weight1(attrs: List[Dict[str, Any]]):
+            return np.random.random([768]).astype(np.float32)
+
+        def generate_weight2(attrs: List[Dict[str, Any]]):
+            return np.random.random([768]).astype(np.float32)
+
+        for batch in [4]:
+            for epsilon in [1e-5]:
+                for begin_norm_axis in [2]:
+                    for enable_int8 in [False, True]:
+                        dics = [{
+                            "epsilon": epsilon,
+                            "begin_norm_axis": begin_norm_axis,
+                        }, {}]
+
+                        ops_config = [{
+                            "op_type": "elementwise_add",
+                            "op_inputs": {
+                                "X": ["inputX_data"],
+                                "Y": ["inputY_data"]
+                            },
+                            "op_outputs": {
+                                "Out": ["ele_out"]
+                            },
+                            "op_attrs": {
+                                "axis": -1
+                            }
+                        }, {
+                            "op_type": "layer_norm",
+                            "op_inputs": {
+                                "X": ["ele_out"],
+                                "Bias": ["Bias"],
+                                "Scale": ["Scale"]
+                            },
+                            "op_outputs": {
+                                "Y": ["layernorm_out"],
+                                "Mean": ["Mean"],
+                                "Variance": ["Variance"]
+                            },
+                            "op_attrs": dics[0]
+                        }]
+                        ops = self.generate_op_config(ops_config)
+                        program_config = ProgramConfig(
+                            ops=ops,
+                            weights={
+                                "Bias":
+                                TensorConfig(
+                                    data_gen=partial(generate_weight1, dics)),
+                                "Scale":
+                                TensorConfig(
+                                    data_gen=partial(generate_weight2, dics))
+                            },
+                            inputs={
+                                "inputX_data":
+                                TensorConfig(data_gen=partial(
+                                    generate_input1, dics, batch)),
+                                "inputY_data":
+                                TensorConfig(data_gen=partial(
+                                    generate_input2, dics, batch))
+                            },
+                            outputs=["ele_out", "layernorm_out"])
+
+                        yield program_config
+
+    def sample_predictor_configs(
+            self, program_config) -> (paddle_infer.Config, List[int], float):
+
+        def generate_dynamic_shape(attrs):
+            self.dynamic_shape.min_input_shape = {
+                "inputX_data": [4, 128, 768],
+                "inputY_data": [4, 128, 768],
+                "Bias": [768],
+                "Scale": [768]
+            }
+            self.dynamic_shape.max_input_shape = {
+                "inputX_data": [4, 128, 768],
+                "inputY_data": [4, 128, 768],
+                "Bias": [768],
+                "Scale": [768]
+            }
+            self.dynamic_shape.opt_input_shape = {
+                "inputX_data": [4, 128, 768],
+                "inputY_data": [4, 128, 768],
+                "Bias": [768],
+                "Scale": [768]
+            }
+
+        def clear_dynamic_shape():
+            self.dynamic_shape.min_input_shape = {}
+            self.dynamic_shape.max_input_shape = {}
+            self.dynamic_shape.opt_input_shape = {}
+
+        def generate_trt_nodes_num(attrs, dynamic_shape):
+            return 1, 4
+
+        attrs = [
+            program_config.ops[i].attrs for i in range(len(program_config.ops))
+        ]
+
+        # just support dynamic_shape
+        generate_dynamic_shape(attrs)
+        self.trt_param.precision = paddle_infer.PrecisionType.Float32
+        yield self.create_inference_config(), generate_trt_nodes_num(
+            attrs, True), 1e-2  # atol=1e-2 while rtol is 1e-8
+        self.trt_param.precision = paddle_infer.PrecisionType.Half
+        yield self.create_inference_config(), generate_trt_nodes_num(
+            attrs, True), 1e-2  # atol=1e-2 while rtol is 1e-8
+
+    def add_skip_trt_case(self):
+        pass
+
+    def test(self):
+        self.add_skip_trt_case()
+        self.run_test()
+
+
+if __name__ == "__main__":
+    unittest.main()

python/paddle/fluid/tests/unittests/ir/test_ir_preln_residual_bias_fuse_pass.py

@@ -57,5 +57,37 @@ class PrelnResidualBiasFusePassTest(PassTest):
             self.check_program(opt_program)
 
 
+class PrelnResidualBiasFusePassNoBiasTest(PassTest):
+
+    def setUp(self):
+        paddle.enable_static()
+        with paddle.static.program_guard(self.main_program,
+                                         self.startup_program):
+            x = paddle.static.data(name="x",
+                                   shape=[128, 768],
+                                   dtype="float32",
+                                   lod_level=0)
+            y = paddle.static.data(name="y",
+                                   shape=[128, 768],
+                                   dtype="float32",
+                                   lod_level=0)
+            elementwise_out = x + y
+            out = paddle.static.nn.layer_norm(input=elementwise_out)
+
+        self.fetch_list = [out, elementwise_out]
+        self.pass_names = "preln_residual_bias_fuse_pass"
+        self.fused_op_type = "preln_residual_bias"
+        self.num_fused_ops = 1
+
+    def test_check_program(self):
+        use_gpu_set = [False]
+        if paddle.device.is_compiled_with_cuda():
+            use_gpu_set.append(True)
+        for use_gpu in use_gpu_set:
+            place = paddle.CUDAPlace(0) if use_gpu else paddle.CPUPlace()
+            opt_program = self._apply_ir_passes()
+            self.check_program(opt_program)
+
+
 if __name__ == "__main__":
     unittest.main()