Merge pull request #11728 from typhoonzero/fix_paraexe_bcast

Fix dist train broadcasting bug

paddle/fluid/framework/details/multi_devices_graph_builder.cc

@@ -483,6 +483,9 @@ void MultiDevSSAGraphBuilder::CreateDistTrainOp(SSAGraph *result,
     }
   } else if (op.Type() == "concat") {
     op_dev_id = GetVarDeviceID(op.InputArgumentNames()[0]);
+    for (auto &varname : op.OutputArgumentNames()) {
+      var_name_on_devices_.emplace(varname, op_dev_id);
+    }
   } else {
     PADDLE_ENFORCE(
         "the distribute training related op should be in [split_byref, "

paddle/fluid/framework/details/ssa_graph_builder.h

@@ -30,7 +30,7 @@ class SSAGraphBuilder {
   SSAGraphBuilder() {}
   virtual ~SSAGraphBuilder() {}
   virtual std::unique_ptr<SSAGraph> Build(const ProgramDesc &program) const = 0;
-  virtual int GetVarDeviceID(const std::string &var_name) const { return -1; }
+  virtual int GetVarDeviceID(const std::string &var_name) const = 0;
 
   DISABLE_COPY_AND_ASSIGN(SSAGraphBuilder);
 

paddle/fluid/framework/details/ssa_graph_checker.h

@@ -16,6 +16,8 @@
 
 #include "paddle/fluid/framework/details/ssa_graph_builder.h"
 
+#include <string>
+
 namespace paddle {
 namespace framework {
 namespace details {
@@ -33,6 +35,10 @@ class SSAGraghBuilderWithChecker : public SSAGraphBuilder {
     return graph;
   }
 
+  int GetVarDeviceID(const std::string& var_name) const override {
+    return builder_->GetVarDeviceID(var_name);
+  }
+
   bool IsValidGraph(const SSAGraph* graph) const;
 
  private:

paddle/fluid/framework/details/ssa_graph_printer.h

@@ -15,6 +15,7 @@
 #pragma once
 
 #include <iosfwd>
+#include <string>
 #include "paddle/fluid/framework/details/ssa_graph_builder.h"
 
 namespace paddle {
@@ -55,6 +56,10 @@ class SSAGraghBuilderWithPrinter : public SSAGraphBuilder {
     return graph;
   }
 
+  int GetVarDeviceID(const std::string& var_name) const override {
+    return builder_->GetVarDeviceID(var_name);
+  }
+
  private:
   std::unique_ptr<SSAGraphPrinter> printer_;
   std::unique_ptr<SSAGraphBuilder> builder_;

paddle/fluid/framework/parallel_executor.cc

@@ -133,17 +133,18 @@ ParallelExecutor::ParallelExecutor(
 
 void ParallelExecutor::BCastParamsToGPUs(
     const std::unordered_set<std::string> &vars) const {
-  // the the initialize bcast, all vars would be bcast from device(0), otherwise
+  // the the initializing bcast, all vars would be bcast from device(0),
+  // otherwise
   // bcast from the specified device.
-  bool initialize = builder_.get() == nullptr ? true : false;
+  bool initializing = builder_.get() == nullptr ? true : false;
 
   for (auto &var : vars) {
     int var_dev_id =
         builder_.get() == nullptr ? -1 : builder_->GetVarDeviceID(var);
-    if (!initialize && var_dev_id == -1) continue;
+    if (!initializing && var_dev_id == -1) continue;
 
     framework::Variable *main_var = nullptr;
-    if (initialize) {
+    if (initializing) {
       main_var = member_->local_scopes_[0]->FindVar(var);
     } else {
       main_var = member_->local_scopes_[var_dev_id]->FindVar(var);
@@ -164,7 +165,8 @@ void ParallelExecutor::BCastParamsToGPUs(
         auto place = member_->places_[i];
         void *buffer;
 
-        if ((initialize && i == 0) || (!initialize && i == var_dev_id)) {
+        if ((initializing && i == 0) ||
+            (!initializing && static_cast<int>(i) == var_dev_id)) {
           buffer = const_cast<void *>(main_tensor.data<void>());
         } else {
           auto local_scope = member_->local_scopes_[i];
@@ -181,8 +183,16 @@ void ParallelExecutor::BCastParamsToGPUs(
         platform::NCCLGroupGuard guard;
         for (size_t i = 0; i < member_->places_.size(); ++i) {
           auto &nccl_ctx = member_->nccl_ctxs_->at(member_->places_[i]);
-          platform::dynload::ncclBcast(buffers[i], numel, data_type, 0,
-                                       nccl_ctx.comm_, nccl_ctx.stream());
+          if (initializing) {
+            platform::dynload::ncclBcast(buffers[i], numel, data_type, 0,
+                                         nccl_ctx.comm_, nccl_ctx.stream());
+          } else {
+            if (var_dev_id >= 0) {
+              platform::dynload::ncclBcast(buffers[i], numel, data_type,
+                                           var_dev_id, nccl_ctx.comm_,
+                                           nccl_ctx.stream());
+            }
+          }
         }
         member_->nccl_ctxs_->WaitAll();
       }

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -302,7 +302,6 @@ class DistributeTranspiler(object):
         """
         # remove optimize ops and add a send op to main_program
         delete_ops(self.origin_program.global_block(), self.optimize_ops)
-        # FIXME(typhoonzero): serialize once will fix error occurs when clone.
         self.origin_program.__str__()
         return self.origin_program
 
@@ -383,11 +382,12 @@ class DistributeTranspiler(object):
             if self._is_adam_connected_op(op):
                 global_ops.append(op)
 
-        def __append_optimize_op__(op, block, grad_to_block_id, merged_var):
+        def __append_optimize_op__(op, block, grad_to_block_id, merged_var,
+                                   lr_ops):
             if self._is_optimizer_op(op):
                 self._append_pserver_ops(block, op, endpoint, grad_to_block_id,
                                          self.origin_program, merged_var)
-            else:
+            elif op not in lr_ops:
                 self._append_pserver_non_opt_ops(block, op)
 
         def __op_have_grad_input__(op):
@@ -447,7 +447,7 @@ class DistributeTranspiler(object):
                 # optimizer is connected to itself
                 if ufind.is_connected(op, opt_op) and op not in global_ops:
                     __append_optimize_op__(op, per_opt_block, grad_to_block_id,
-                                           merged_var)
+                                           merged_var, lr_ops)
 
         # append global ops
         if global_ops:
@@ -455,7 +455,7 @@ class DistributeTranspiler(object):
                 pserver_program.num_blocks - 1)
             for glb_op in global_ops:
                 __append_optimize_op__(glb_op, opt_state_block,
-                                       grad_to_block_id, None)
+                                       grad_to_block_id, None, lr_ops)
 
         # process distributed lookup_table
         prefetch_var_name_to_block_id = []