Support various length support for SelectedRows in GLOO::AllGather (#36637)

* In cpu parallel using gloo, add various length support for SelectedRows

* fix bug

* fix bugs

* fix by code review

* remove timeout

paddle/fluid/framework/fleet/gloo_wrapper.h

@@ -27,6 +27,7 @@ limitations under the License. */
 #include <vector>
 #ifdef PADDLE_WITH_GLOO
 #include <gloo/allgather.h>
+#include <gloo/allgatherv.h>
 #include <gloo/allreduce.h>
 #include <gloo/barrier.h>
 #include <gloo/rendezvous/context.h>
@@ -238,10 +239,25 @@ class GlooWrapper {
     return ret;
   }
 
-  // TODO(xiongkun03): support all gather array of
+  // NOTE(@xiongkun03): support all gather array of
   //                   numbers with different length
-  //                   can use AllgathervOptions, may be work in different
-  //                   occasion. Need some survey.
+  //                   if the third argument is int, use allgather,
+  //                   if it is vector, use AllgathervOptions,
+  //                   which works in different length occasion.
+  template <typename T>
+  void AllGatherVector(T* input_ptr, T* output_ptr,
+                       std::vector<size_t>& element_nums) {  // NOLINT
+    CHECK_EQ(is_initialized_, true);
+#ifdef PADDLE_WITH_GLOO
+    gloo::AllgathervOptions opts(context_);
+    opts.setInput(input_ptr, element_nums[rank_]);
+    opts.setOutput(output_ptr, element_nums);
+    gloo::allgatherv(opts);
+#else
+    LOG(WARNING) << "AllGather does nothing when WITH_GLOO=OFF";
+#endif
+  }
+
   template <typename T>
   void AllGatherVector(T* input_ptr, T* output_ptr,
                        size_t element_num) {  // NOLINT

paddle/fluid/imperative/gloo_context.cc

@@ -55,12 +55,10 @@ void GLOOParallelContext::InitWithRingID(int ring_id) {
 
 #define GLOO_CASE(type, T, gw)                                  \
   case type: {                                                  \
-    VLOG(4) << "Use the gloo all reduce to sync. SRC:" << src_tensor; \
     std::vector<T> send_vector##T;                              \
     framework::TensorToVector<T>(src_tensor, &send_vector##T);  \
     auto recv_vector##T = gw->AllReduce<T>(send_vector##T);     \
     framework::TensorFromVector<T>(recv_vector##T, dst_tensor); \
-    VLOG(4) << "DST:" << *dst_tensor;                                 \
     break;                                                      \
   }
 
@@ -118,7 +116,7 @@ void GLOOParallelContext::AllReduce(const framework::Tensor &src_tensor,
     const auto *src_tensor_ptr = src_tensor.data<T>();            \
     gw->AllGatherVector<T>(const_cast<T *>(src_tensor_ptr),       \
                            reinterpret_cast<T *>(dst_tensor_ptr), \
-                           value_sendcount);                      \
+                           element_nums);                         \
     break;                                                        \
   }
 
@@ -150,48 +148,31 @@ void GLOOParallelContext::AllReduce(const framework::SelectedRows &src,
   auto *dst_rows_ptr = dst_rows->MutableData(place);
   const int64_t *src_rows_ptr = src_rows.Data(place);
 
-  // VLOG(3) << "Selected Rows of src:" << string::join_strings(dst_rows, ',')
-
   auto *dst_tensor = dst->mutable_value();
   auto dims = src_tensor.dims();
   dims[0] = rows_num;
   auto feature_size = framework::product(dims) / dims[0];
   dst_tensor->Resize(dims);
-  if (std::all_of(cpu_rows_num_ptr, cpu_rows_num_ptr + nranks,
-                  [&](size_t row) { return row == cpu_rows_num_ptr[0]; })) {
-    // During sparse communication, the number of each card is same.
-    // Because gloo wrapper utility class currently don't support
-    // broadcast, so we only deal the-same case.
-    VLOG(3) << "Use the gloo all reduce to sync. SRC:" << src_tensor;
-    // framework::SerializeToStream(VLOG(4), src);
-    VLOG(3) << "allgather replaces broadcast to speed up in sparse allreduce";
-    auto value_sendcount = cpu_rows_num_ptr[0] * feature_size;
-    auto *dst_tensor_ptr = dst_tensor->mutable_data(place, dtype);
 
+  std::vector<size_t> element_nums = rows_num_vector;
+  std::for_each(element_nums.begin(), element_nums.end(),
+                [feature_size](size_t &x) { x = x * feature_size; });
+
+  auto *dst_tensor_ptr = dst_tensor->mutable_data(place, dtype);
   gloo_wrapper->AllGatherVector<int64_t>(const_cast<int64_t *>(src_rows_ptr),
                                          static_cast<int64_t *>(dst_rows_ptr),
-                                           rows_num_vector[0]);
+                                         rows_num_vector);
 
   switch (dtype) {
-      GLOO_ALL_GATHER_CASE(framework::proto::VarType::FP32, float,
-                           gloo_wrapper);
-      GLOO_ALL_GATHER_CASE(framework::proto::VarType::FP64, double,
-                           gloo_wrapper);
+    GLOO_ALL_GATHER_CASE(framework::proto::VarType::FP32, float, gloo_wrapper);
+    GLOO_ALL_GATHER_CASE(framework::proto::VarType::FP64, double, gloo_wrapper);
     GLOO_ALL_GATHER_CASE(framework::proto::VarType::INT32, int, gloo_wrapper);
     GLOO_ALL_GATHER_CASE(framework::proto::VarType::INT64, int64_t,
                          gloo_wrapper);
     default: {
-        PADDLE_THROW(platform::errors::InvalidArgument(
-            "Invalid datatype for allreduce"));
-      }
+      PADDLE_THROW(
+          platform::errors::InvalidArgument("Invalid datatype for allreduce"));
     }
-    VLOG(3) << "Selected Row DST:" << *dst_tensor;
-    VLOG(3) << "Selected Rows of DST:"
-            << string::join_strings(std::vector<int64_t>(*dst_rows), ',');
-  } else {
-    PADDLE_THROW(platform::errors::InvalidArgument(
-        "The number of each card is not the same, gloo only support the-same"
-        "batch division"));
   }
 }
 

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

@@ -214,6 +214,7 @@ if (NOT WITH_GLOO)
     LIST(REMOVE_ITEM TEST_OPS test_parallel_dygraph_unused_variables_gloo)
     LIST(REMOVE_ITEM TEST_OPS test_parallel_dygraph_sparse_embedding_over_height_gloo)
     LIST(REMOVE_ITEM TEST_OPS test_parallel_dygraph_sparse_embedding_gloo)
+    LIST(REMOVE_ITEM TEST_OPS test_parallel_dygraph_sparse_embedding_diff_length_gloo)
 endif()
 
 if ((NOT WITH_GPU) AND (NOT WITH_ROCM))

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

@@ -515,6 +515,24 @@ class TestParallelDyGraphRunnerBase(object):
             return batch
         elif args.update_method != "local":
             new_batch = []
+
+            # NOTE(@xiongkun03) args.diff_batch means batch length is different: 
+            # such as : batch = [2,3,4,5], then the first rank will get [2]  and 
+            # the second rank will get [3,4,5]. 
+            # this function is for test sparse_embedding_differ_length
+            if hasattr(args, "diff_batch") and args.diff_batch:
+                assert len(
+                    batch) > 2, "in differ_batch mode, len(batch) must > 2."
+                if paddle.distributed.get_rank() == 0:
+                    new_batch.append(batch[0])
+                elif paddle.distributed.get_rank() == 1:
+                    new_batch.extend([_ for _ in batch[1:]])
+                else:
+                    raise NotImplementedError(
+                        "Current TestParallelDyGraphRunnerBase don't support world_size > 2"
+                    )
+                return new_batch
+            else:
                 for offset, item in enumerate(batch):
                     if offset % 2 == args.trainer_id:
                         new_batch.append(item)
@@ -699,6 +717,7 @@ def runtime_main(test_class):
     parser.add_argument('--use_fleet_api', action='store_true')
     parser.add_argument('--use_fleet_api_20', action='store_true')
     parser.add_argument('--use_local_sgd', action='store_true')
+    parser.add_argument('--diff_batch', action='store_true')
     parser.add_argument('--ut4grad_allreduce', action='store_true')
     parser.add_argument(
         '--hallreduce_inter_nranks', type=int, required=False, default=2)
@@ -798,6 +817,7 @@ class TestDistBase(unittest.TestCase):
         self._gloo_mode = False  # now, support gloo backend
         self._pipeline_mode = False
         self._mp_mode = False
+        self._diff_batch = False
         # FIXME(typhoonzero): I added this stupid argument to enable
         # testing allreduce layers, which users can call layers.allreduce
         # to accumulate tensors at anywhere. Find a better way to do this
@@ -1100,6 +1120,8 @@ class TestDistBase(unittest.TestCase):
         #assert self._use_reader_alloc == False, "gloo not support _use_reduce"
         if self._save_model:
             tr_cmd += " --save_model"
+        if self._diff_batch:
+            tr_cmd += " --diff_batch"
         self.__use_cuda = False
         self.__use_xpu = False
         assert self.__use_cuda == False, "gloo not support use cuda"

python/paddle/fluid/tests/unittests/test_parallel_dygraph_sparse_embedding_diff_length_gloo.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 print_function
+
+import os
+import sys
+import unittest
+
+import paddle.fluid as fluid
+from test_dist_base import TestDistBase
+from spawn_runner_base import TestDistSpawnRunner
+from parallel_dygraph_sparse_embedding import TestSparseEmbedding
+from parallel_dygraph_sparse_embedding_fp64 import TestSparseEmbeddingFP64
+
+flag_name = os.path.splitext(__file__)[0]
+
+
+class TestParallelDygraphSparseEmdedding_GLOO(TestDistBase):
+    def _setup_config(self):
+        self._sync_mode = False
+        self._gloo_mode = True
+        self._dygraph = True
+        self._diff_batch = True
+
+    def test_sparse_embedding(self):
+        self.check_with_place(
+            "parallel_dygraph_sparse_embedding.py",
+            delta=1e-5,
+            check_error_log=True,
+            log_name=flag_name)
+
+
+if __name__ == "__main__":
+    unittest.main()