fix ParallelDesc Constructor bug (#4118)

* fix parallel

* optimize maybeinit

* add test file

Former-commit-id: e6aaee0

oneflow/core/job/parallel_desc.cpp

@@ -80,31 +80,28 @@ Maybe<ParallelDesc> ParallelDesc::New(int64_t symbol_id, const ParallelConf& par
 Maybe<void> ParallelDesc::MaybeInit(const ParallelConf& user_conf) {
   parallel_conf_ = user_conf;
   cfg_parallel_conf_.reset(new cfg::ParallelConf(user_conf));
-  HashSet<int64_t> machine_id_set;
   device_type_ = DeviceType::kInvalidDevice;
   const std::string& device_tag = parallel_conf_.device_tag();
   DeviceType device_type = JUST(DeviceType4DeviceTag(device_tag));
   CHECK_OR_RETURN(device_type_ == DeviceType::kInvalidDevice || device_type_ == device_type);
   device_type_ = device_type;
+  machine_id2sorted_dev_phy_ids_ =
+      std::make_shared<HashMap<int64_t, std::shared_ptr<std::vector<int64_t>>>>();
   for (const std::string& device_name : parallel_conf_.device_name()) {
     int64_t mchn_id;
     std::string device_id_str;
     JUST(ParseDeviceNameConf(device_name, &mchn_id, &device_id_str));
-    machine_id_set.insert(mchn_id);
-    if (machine_id_set.find(mchn_id) == machine_id_set.end()) {
-      sorted_machine_ids_.push_back(mchn_id);
-    }
     int64_t minus_pos = device_id_str.find("-");
     if (minus_pos == std::string::npos) {
       device_id_str = device_id_str + "-" + device_id_str;
       minus_pos = device_id_str.find("-");
     }
     int64_t min_id = oneflow_cast<int64_t>(device_id_str.substr(0, minus_pos));
     int64_t max_id = oneflow_cast<int64_t>(device_id_str.substr(minus_pos + 1));
-    machine_id2sorted_dev_phy_ids_ =
-        std::make_shared<HashMap<int64_t, std::shared_ptr<std::vector<int64_t>>>>();
-    (*machine_id2sorted_dev_phy_ids_)[mchn_id] = std::make_shared<std::vector<int64_t>>();
     CHECK_LE_OR_RETURN(min_id, max_id);
+    if (!(*machine_id2sorted_dev_phy_ids_)[mchn_id]) {
+      (*machine_id2sorted_dev_phy_ids_)[mchn_id] = std::make_shared<std::vector<int64_t>>();
+    }
     for (int64_t dev_phy_id = min_id; dev_phy_id <= max_id; ++dev_phy_id) {
       (*machine_id2sorted_dev_phy_ids_)[mchn_id]->push_back(dev_phy_id);
     }

oneflow/core/job/parallel_desc_test.cpp

@@ -0,0 +1,65 @@
+/*
+Copyright 2020 The OneFlow 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.
+*/
+#include "oneflow/core/common/util.h"
+#include "oneflow/core/job/placement.pb.h"
+#include "oneflow/core/job/parallel_desc.h"
+
+namespace oneflow {
+namespace test {
+
+TEST(parallel_desc, continuous_1n4d) {
+  ParallelConf parallel_conf;
+  parallel_conf.set_device_tag("cpu");
+  parallel_conf.add_device_name("0:0-3");
+  ParallelDesc parallel_desc(parallel_conf);
+  ASSERT_EQ(parallel_desc.device_tag(), "cpu");
+  ASSERT_EQ(parallel_desc.parallel_num(), 4);
+}
+
+TEST(parallel_desc, discrete_1n4d) {
+  ParallelConf parallel_conf;
+  parallel_conf.set_device_tag("cpu");
+  parallel_conf.add_device_name("0:0-1");
+  parallel_conf.add_device_name("0:2-3");
+  ParallelDesc parallel_desc(parallel_conf);
+  ASSERT_EQ(parallel_desc.device_tag(), "cpu");
+  ASSERT_EQ(parallel_desc.parallel_num(), 4);
+}
+
+TEST(parallel_desc, continuous_2n8d) {
+  ParallelConf parallel_conf;
+  parallel_conf.set_device_tag("cpu");
+  parallel_conf.add_device_name("0:0-3");
+  parallel_conf.add_device_name("1:0-3");
+  ParallelDesc parallel_desc(parallel_conf);
+  ASSERT_EQ(parallel_desc.device_tag(), "cpu");
+  ASSERT_EQ(parallel_desc.parallel_num(), 8);
+}
+
+TEST(parallel_desc, discrete_2n8d) {
+  ParallelConf parallel_conf;
+  parallel_conf.set_device_tag("cpu");
+  parallel_conf.add_device_name("0:0-1");
+  parallel_conf.add_device_name("0:2-3");
+  parallel_conf.add_device_name("1:0-1");
+  parallel_conf.add_device_name("1:2-3");
+  ParallelDesc parallel_desc(parallel_conf);
+  ASSERT_EQ(parallel_desc.device_tag(), "cpu");
+  ASSERT_EQ(parallel_desc.parallel_num(), 8);
+}
+
+}  // namespace test
+}  // namespace oneflow