fix bugs in mp_layers、pp_layers and HybridParallelClipGrad (#36144)

* fix calling bug of HybridParallelClipGrad

* fix bugs of HybridParallelClipGrad

* add unittest of pp with HybridParallelClipGrad

* fix bugs in mp_layers.py

* update

* fix bugs in pp_layers.py

* update

python/paddle/distributed/fleet/meta_optimizers/dygraph_optimizer/hybrid_parallel_optimizer.py

@@ -52,6 +52,7 @@ class HybridParallelClipGrad:
         params_and_grads = []
         sum_square_list_dist = []
         sum_square_list_not_dist = []
+
         for p, g in params_grads:
             if g is None:
                 continue
@@ -64,29 +65,38 @@ class HybridParallelClipGrad:
             square = layers.square(merge_grad)
             sum_square = layers.reduce_sum(square)
 
-            if p.is_distributed:
-                sum_square_list_dist.append(sum_square)
-            else:
-                sum_square_list_not_dist.append(sum_square)
+            not_shared_enable = (not hasattr(p, 'is_firstly_shared')) or (
+                hasattr(p, 'is_firstly_shared') and
+                getattr(p, 'is_firstly_shared', True))
 
-        # all parameters have been filterd out
-        if len(sum_square_list_dist) + len(sum_square_list_not_dist) == 0:
-            return params_grads
+            if not_shared_enable:
+                if p.is_distributed:
+                    sum_square_list_dist.append(sum_square)
+                else:
+                    sum_square_list_not_dist.append(sum_square)
 
         global_norm_var_dist = layers.concat(sum_square_list_dist) if len(
             sum_square_list_dist) != 0 else layers.concat(
                 [paddle.to_tensor([0.])])
         global_norm_var_dist = layers.reduce_sum(global_norm_var_dist)
+
         global_norm_var_not_dist = layers.concat(
             sum_square_list_not_dist) if len(
                 sum_square_list_not_dist) != 0 else layers.concat(
                     [paddle.to_tensor([0.])])
         global_norm_var_not_dist = layers.reduce_sum(global_norm_var_not_dist)
 
-        # add all reduce to get global norm of distributed params_and_grads in world size
-        # all reduce is not needed while getting global norm of non-distributed params_and_grads
-        paddle.distributed.all_reduce(
-            global_norm_var_dist, group=self._hcg.get_check_parallel_group())
+        # add all reduce to get global norm of distributed params_and_grads
+        if self._hcg.get_model_parallel_world_size() > 1:
+            paddle.distributed.all_reduce(
+                global_norm_var_dist,
+                group=self._hcg.get_check_parallel_group())
+
+        # add all reduce to get global norm of non-distributed params_and_grads in groups of pp
+        if self._hcg.get_pipe_parallel_world_size() > 1:
+            paddle.distributed.all_reduce(
+                global_norm_var_not_dist,
+                group=self._hcg.get_pipe_parallel_group())
 
         # In Sharding mode, param and grad is mapping different rank in optimizer.
         # ClipGradByGlobalNorm need allreduce to get globol norm
@@ -143,8 +153,8 @@ class HybridParallelOptimizer:
 
         if isinstance(self._inner_opt._grad_clip,
                       ClipGradByGlobalNorm) and not self._use_dp_mode:
-            logger.warning("using ClipGradByGlobalNorm in TensorParallel, the origin " \
-                  "optmizer'grad clip will be changed.")
+            logger.warning("While using ClipGradByGlobalNorm in TensorParallel, PipelineParallel " \
+                           "or Sharding, the grad clip of original optimizer will be changed.")
 
             if self._sharding_enable:
                 # change sharding inner_optimizer's _grad_clip

python/paddle/distributed/fleet/meta_parallel/parallel_layers/mp_layers.py

@@ -70,7 +70,7 @@ class VocabParallelEmbedding(Layer):
                 dtype=self._dtype,
                 is_bias=False)
 
-        self.weight.is_distributed = True
+        self.weight.is_distributed = True if self.is_mp else False
 
     def forward(self, x):
         if self.is_mp:
@@ -135,7 +135,7 @@ class ColumnParallelLinear(Layer):
                 dtype=self._dtype,
                 is_bias=False)
 
-        self.weight.is_distributed = True
+        self.weight.is_distributed = True if self.is_mp else False
 
         if has_bias:
             # initialize bias to zero like Megatron
@@ -144,7 +144,7 @@ class ColumnParallelLinear(Layer):
                 attr=paddle.nn.initializer.Constant(value=0.0),
                 dtype=self._dtype,
                 is_bias=True)
-            self.bias.is_distributed = True
+            self.bias.is_distributed = True if self.is_mp else False
         else:
             self.bias = None
 
@@ -212,7 +212,7 @@ class RowParallelLinear(Layer):
                 dtype=self._dtype,
                 is_bias=False)
 
-        self.weight.is_distributed = True
+        self.weight.is_distributed = True if self.is_mp else False
 
         if has_bias:
             self.bias = self.create_parameter(

python/paddle/distributed/fleet/meta_parallel/parallel_layers/pp_layers.py

@@ -261,6 +261,10 @@ class PipelineLayer(Layer):
                     src=min(comm['ranks']),
                     group=comm['group'])
 
+            for param in comm['layer'].parameters():
+                if self.global_rank != min(comm['ranks']):
+                    setattr(param, 'is_firstly_shared', False)
+
     def allreduce_shared_weight_gradients(self):
         for key, comm in self.shared_comm.items():
             param = getattr(self.shared_layers[key], comm['weight_attr'])
@@ -316,6 +320,9 @@ class PipelineLayer(Layer):
                     self.shared_layers[layer.layer_name] = layer.build_layer()
                     self.shared_weight_attrs[
                         layer.layer_name] = layer.shared_weight_attr
+                    for param in self.shared_layers[
+                            layer.layer_name].parameters():
+                        setattr(param, "is_firstly_shared", True)
 
                 if layer.forward_func is None:
                     self.run_function.append(self.shared_layers[

python/paddle/fluid/tests/unittests/hybrid_parallel_pp_alexnet.py

@@ -53,6 +53,13 @@ class TestDistPPTraning(unittest.TestCase):
         }
         fleet.init(is_collective=True, strategy=strategy)
 
+    def build_optimizer(self, model):
+        scheduler = paddle.optimizer.lr.PiecewiseDecay(
+            boundaries=[2], values=[0.001, 0.002], verbose=True)
+        optimizer = paddle.optimizer.SGD(learning_rate=scheduler,
+                                         parameters=model.parameters())
+        return scheduler, optimizer
+
     def test_pp_model(self):
         hcg = fleet.get_hybrid_communicate_group()
         word_size = hcg.get_model_parallel_world_size()
@@ -63,10 +70,7 @@ class TestDistPPTraning(unittest.TestCase):
 
         #construct model a
         model_a = AlexNet(10)
-        scheduler_a = paddle.optimizer.lr.PiecewiseDecay(
-            boundaries=[2], values=[0.001, 0.002], verbose=True)
-        optimizer_a = paddle.optimizer.SGD(learning_rate=scheduler_a,
-                                           parameters=model_a.parameters())
+        scheduler_a, optimizer_a = self.build_optimizer(model_a)
 
         param_len = len(model_a.parameters())
 
@@ -76,10 +80,7 @@ class TestDistPPTraning(unittest.TestCase):
 
         # construct model b
         model_b = AlexNetPipeDesc(num_stages=self.pipeline_parallel_size)
-        scheduler_b = paddle.optimizer.lr.PiecewiseDecay(
-            boundaries=[2], values=[0.001, 0.002], verbose=True)
-        optimizer_b = paddle.optimizer.SGD(learning_rate=scheduler_b,
-                                           parameters=model_b.parameters())
+        scheduler_b, optimizer_b = self.build_optimizer(model_b)
         model_b = fleet.distributed_model(model_b)
         optimizer_b = fleet.distributed_optimizer(optimizer_b)
 

python/paddle/fluid/tests/unittests/hybrid_parallel_pp_clip_grad.py

+# Copyright (c) 2021 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 __future__ import division
+from __future__ import print_function
+
+import paddle
+import unittest
+from hybrid_parallel_pp_alexnet import TestDistPPTraning
+
+
+class TestPPClipGrad(TestDistPPTraning):
+    def build_optimizer(self, model):
+        grad_clip = paddle.nn.ClipGradByGlobalNorm(0.5)
+        scheduler = paddle.optimizer.lr.PiecewiseDecay(
+            boundaries=[2], values=[0.001, 0.002], verbose=True)
+        optimizer = paddle.optimizer.SGD(learning_rate=scheduler,
+                                         grad_clip=grad_clip,
+                                         parameters=model.parameters())
+        return scheduler, optimizer
+
+
+if __name__ == "__main__":
+    unittest.main()

python/paddle/fluid/tests/unittests/test_parallel_dygraph_pipeline_parallel.py

@@ -42,6 +42,9 @@ class TestHybridPipeParallel(TestMultipleGpus):
     def test_hybrid_parallel_recompute(self):
         self.run_mnist_2gpu('hybrid_parallel_pp_recompute.py')
 
+    def test_hybrid_parallel_pp_clip_grad(self):
+        self.run_mnist_2gpu('hybrid_parallel_pp_clip_grad.py')
+
 
 if __name__ == "__main__":
     unittest.main()