fix distributedSampler reshuffle and fix random_device failed

mindspore/ccsrc/dataset/util/random.h

@@ -19,13 +19,16 @@
 #if defined(_WIN32) || defined(_WIN64)
 #include <stdlib.h>
 #endif
+#include <chrono>
 #include <limits>
 #include <memory>
 #include <random>
 #include <string>
+#include <thread>
 
 #include "dataset/core/config_manager.h"
 #include "dataset/core/global_context.h"
+#include "utils/log_adapter.h"
 
 namespace mindspore {
 namespace dataset {
@@ -35,6 +38,17 @@ inline std::mt19937 GetRandomDevice() {
   rand_s(&number);
   std::mt19937 random_device{static_cast<uint32_t>(number)};
 #else
+  int i = 0;
+  while (i < 5) {
+    try {
+      std::mt19937 random_device{std::random_device("/dev/urandom")()};
+      return random_device;
+    } catch (const std::exception &e) {
+      MS_LOG(WARNING) << "Get std::random_device failed, retry: " << i << ", error: " << e.what();
+      std::this_thread::sleep_for(std::chrono::milliseconds(10));
+      i++;
+    }
+  }
   std::mt19937 random_device{std::random_device("/dev/urandom")()};
 #endif
   return random_device;

mindspore/ccsrc/mindrecord/include/shard_distributed_sample.h

@@ -44,8 +44,8 @@ class ShardDistributedSample : public ShardSample {
  private:
   bool shuffle_;
   int no_of_padded_samples_;
-
-  bool init_judgment_;  // we should judge the (num_sample + num_padded) % num_shards == 0 in first time
+  bool first_epoch_;  // check  (num_sample + num_padded) % num_shards == 0 in first epoch
+  ShardTask task_;    // maintain the input tasks in first epoch
 };
 }  // namespace mindrecord
 }  // namespace mindspore

mindspore/ccsrc/mindrecord/include/shard_task.h

@@ -17,6 +17,7 @@
 #ifndef MINDRECORD_INCLUDE_SHARD_TASK_H_
 #define MINDRECORD_INCLUDE_SHARD_TASK_H_
 
+#include <algorithm>
 #include <iostream>
 #include <string>
 #include <tuple>
@@ -27,6 +28,14 @@ namespace mindspore {
 namespace mindrecord {
 class ShardTask {
  public:
+  ShardTask();
+
+  ShardTask(const ShardTask &task);  // copy construction
+
+  ShardTask &operator=(const ShardTask &task);  // assignment operator
+
+  ~ShardTask() = default;
+
   void MakePerm();
 
   void InsertTask(TaskType task_type, int shard_id, int group_id, const std::vector<uint64_t> &offset,
@@ -46,10 +55,11 @@ class ShardTask {
 
   static ShardTask Combine(std::vector<ShardTask> &category_tasks, bool replacement, int64_t num_elements);
 
-  uint32_t categories = 1;
+  uint32_t categories;
 
-  std::vector<std::tuple<TaskType, std::tuple<int, int>, std::vector<uint64_t>, json>> task_list_;
   std::vector<int> permutation_;
+
+  std::vector<std::tuple<TaskType, std::tuple<int, int>, std::vector<uint64_t>, json>> task_list_;
 };
 }  // namespace mindrecord
 }  // namespace mindspore

mindspore/ccsrc/mindrecord/io/shard_reader.cc

@@ -1434,14 +1434,15 @@ void ShardReader::ShuffleTask() {
   for (const auto &op : operators_) {
     if (std::dynamic_pointer_cast<ShardShuffle>(op) && has_sharding == false) {
       if (SUCCESS != (*op)(tasks_)) {
-        MS_LOG(WARNING) << "Reshuffle reader tasks failed.";
+        MS_LOG(WARNING) << "Redo randomSampler failed.";
       }
     } else if (std::dynamic_pointer_cast<ShardDistributedSample>(op)) {
-      if (SUCCESS != op->PreExecute(tasks_)) {
-        MS_LOG(WARNING) << "Distribute reshuffle reader tasks failed.";
+      if (SUCCESS != (*op)(tasks_)) {
+        MS_LOG(WARNING) << "Redo distributeSampler failed.";
       }
     }
   }
+  if (tasks_.permutation_.empty()) tasks_.MakePerm();
 }
 
 }  // namespace mindrecord

mindspore/ccsrc/mindrecord/meta/shard_distributed_sample.cc

@@ -27,7 +27,7 @@ ShardDistributedSample::ShardDistributedSample(int num_shards, int shard_id, int
     : ShardSample(1, num_shards, shard_id),
       shuffle_(shuffle),
       no_of_padded_samples_(no_of_padded_samples),
-      init_judgment_(false) {
+      first_epoch_(true) {
   shuffle_op_ = std::make_shared<ShardShuffle>(seed, kShuffleSample);
 }
 
@@ -54,8 +54,7 @@ int64_t ShardDistributedSample::GetNumSamples(int64_t dataset_size, int64_t num_
 
 MSRStatus ShardDistributedSample::PreExecute(ShardTask &tasks) {
   auto total_no = tasks.Size();
-  if (no_of_padded_samples_ > 0 && init_judgment_ == false) {  // we only judge this in first time
-    init_judgment_ = true;
+  if (no_of_padded_samples_ > 0 && first_epoch_) {
     if (total_no % denominator_ != 0) {
       MS_LOG(ERROR) << "Dataset size plus number of padded samples is not divisible by number of shards. "
                     << "task size: " << total_no << ", number padded: " << no_of_padded_samples_
@@ -63,6 +62,12 @@ MSRStatus ShardDistributedSample::PreExecute(ShardTask &tasks) {
       return FAILED;
     }
   }
+  if (first_epoch_) {
+    first_epoch_ = false;
+    task_ = tasks;
+  } else {
+    tasks = task_;
+  }
   if (shuffle_ == true) {
     if (SUCCESS != (*shuffle_op_)(tasks)) {
       return FAILED;

mindspore/ccsrc/mindrecord/meta/shard_shuffle.cc

@@ -43,6 +43,7 @@ int64_t ShardShuffle::GetNumSamples(int64_t dataset_size, int64_t num_classes) {
 }
 
 MSRStatus ShardShuffle::Execute(ShardTask &tasks) {
+  if (reshuffle_each_epoch_) shuffle_seed_++;
   if (tasks.categories < 1) {
     return FAILED;
   }
@@ -81,7 +82,6 @@ MSRStatus ShardShuffle::Execute(ShardTask &tasks) {
       }
     }
   }
-  if (reshuffle_each_epoch_) shuffle_seed_++;
   return SUCCESS;
 }
 }  // namespace mindrecord

mindspore/ccsrc/mindrecord/meta/shard_task.cc

@@ -24,6 +24,19 @@ using mindspore::MsLogLevel::DEBUG;
 
 namespace mindspore {
 namespace mindrecord {
+ShardTask::ShardTask() : categories(1) {}
+
+ShardTask::ShardTask(const ShardTask &other)
+    : categories(other.categories), permutation_(other.permutation_), task_list_(other.task_list_) {}
+
+ShardTask &ShardTask::operator=(const ShardTask &other) {
+  ShardTask tmp(other);
+  std::swap(categories, tmp.categories);
+  permutation_.swap(tmp.permutation_);
+  task_list_.swap(tmp.task_list_);
+  return *this;
+}
+
 void ShardTask::MakePerm() {
   permutation_ = std::vector<int>(task_list_.size());
   for (uint32_t i = 0; i < task_list_.size(); i++) {

tests/ut/python/dataset/test_minddataset.py

@@ -278,6 +278,41 @@ def test_cv_minddataset_partition_tutorial_check_shuffle_result(add_and_remove_c
         epoch3 = []
 
 
+def test_cv_minddataset_partition_tutorial_check_whole_reshuffle_result_per_epoch(add_and_remove_cv_file):
+    """tutorial for cv minddataset."""
+    columns_list = ["data", "file_name", "label"]
+    num_readers = 4
+    num_shards = 3
+    epoch_result = [[["", "", "", ""], ["", "", "", ""], ["", "", "", ""]],    # save partition 0 result
+                    [["", "", "", ""], ["", "", "", ""], ["", "", "", ""]],    # save partition 1 result
+                    [["", "", "", ""], ["", "", "", ""], ["", "", "", ""]]]    # svae partition 2 result
+
+    for partition_id in range(num_shards):
+        data_set = ds.MindDataset(CV_FILE_NAME + "0", columns_list, num_readers,
+                                  num_shards=num_shards, shard_id=partition_id)
+
+        data_set = data_set.repeat(3)
+
+        num_iter = 0
+        for item in data_set.create_dict_iterator():
+            logger.info("-------------- partition : {} ------------------------".format(partition_id))
+            logger.info("-------------- item[file_name]: {}-----------------------".format(item["file_name"]))
+            logger.info("-------------- item[label]: {} -----------------------".format(item["label"]))
+            # total 3 partition, 4 result per epoch, total 12 result
+            epoch_result[partition_id][int(num_iter / 4)][num_iter % 4] = item["file_name"]    # save epoch result
+            num_iter += 1
+        assert num_iter == 12
+        assert epoch_result[partition_id][0] not in (epoch_result[partition_id][1], epoch_result[partition_id][2])
+        assert epoch_result[partition_id][1] not in (epoch_result[partition_id][0], epoch_result[partition_id][2])
+        assert epoch_result[partition_id][2] not in (epoch_result[partition_id][1], epoch_result[partition_id][0])
+        epoch_result[partition_id][0].sort()
+        epoch_result[partition_id][1].sort()
+        epoch_result[partition_id][2].sort()
+        assert epoch_result[partition_id][0] != epoch_result[partition_id][1]
+        assert epoch_result[partition_id][1] != epoch_result[partition_id][2]
+        assert epoch_result[partition_id][2] != epoch_result[partition_id][0]
+
+
 def test_cv_minddataset_check_shuffle_result(add_and_remove_cv_file):
     """tutorial for cv minddataset."""
     columns_list = ["data", "file_name", "label"]

tests/ut/python/dataset/test_minddataset_padded.py

@@ -468,6 +468,64 @@ def test_nlp_minddataset_reader_basic_padded_samples_multi_epoch(add_and_remove_
     partitions(5, 5, 3)
     partitions(9, 8, 2)
 
+
+def test_nlp_minddataset_reader_basic_padded_samples_check_whole_reshuffle_result_per_epoch(add_and_remove_nlp_file):
+    columns_list = ["input_ids", "id", "rating"]
+
+    padded_sample = {}
+    padded_sample['id'] = "-1"
+    padded_sample['input_ids'] = np.array([-1,-1,-1,-1], dtype=np.int64)
+    padded_sample['rating'] = 1.0
+    num_readers = 4
+    repeat_size = 3
+
+    def partitions(num_shards, num_padded, dataset_size):
+        num_padded_iter = 0
+        num_iter = 0
+
+        epoch_result = [[["" for i in range(dataset_size)] for i in range(repeat_size)] for i in range(num_shards)]
+
+        for partition_id in range(num_shards):
+            data_set = ds.MindDataset(NLP_FILE_NAME + "0", columns_list, num_readers,
+                                      num_shards=num_shards,
+                                      shard_id=partition_id,
+                                      padded_sample=padded_sample,
+                                      num_padded=num_padded)
+            assert data_set.get_dataset_size() == dataset_size
+            data_set = data_set.repeat(repeat_size)
+            inner_num_iter = 0
+            for item in data_set.create_dict_iterator():
+                logger.info("-------------- item[id]: {} ------------------------".format(item["id"]))
+                logger.info("-------------- item[rating]: {} --------------------".format(item["rating"]))
+                logger.info("-------------- item[input_ids]: {}, shape: {} -----------------"
+                    .format(item["input_ids"], item["input_ids"].shape))
+                if item['id'] == bytes('-1', encoding='utf-8'):
+                    num_padded_iter += 1
+                    assert item['id'] == bytes(padded_sample['id'], encoding='utf-8')
+                    assert (item['input_ids'] == padded_sample['input_ids']).all()
+                    assert (item['rating'] == padded_sample['rating']).all()
+                # save epoch result
+                epoch_result[partition_id][int(inner_num_iter / dataset_size)][inner_num_iter % dataset_size] = item["id"]
+                num_iter += 1
+                inner_num_iter += 1
+            assert epoch_result[partition_id][0] not in (epoch_result[partition_id][1], epoch_result[partition_id][2])
+            assert epoch_result[partition_id][1] not in (epoch_result[partition_id][0], epoch_result[partition_id][2])
+            assert epoch_result[partition_id][2] not in (epoch_result[partition_id][1], epoch_result[partition_id][0])
+            if dataset_size > 2:
+                epoch_result[partition_id][0].sort()
+                epoch_result[partition_id][1].sort()
+                epoch_result[partition_id][2].sort()
+                assert epoch_result[partition_id][0] != epoch_result[partition_id][1]
+                assert epoch_result[partition_id][1] != epoch_result[partition_id][2]
+                assert epoch_result[partition_id][2] != epoch_result[partition_id][0]
+        assert num_padded_iter == num_padded * repeat_size
+        assert num_iter == dataset_size * num_shards * repeat_size
+
+    partitions(4, 6, 4)
+    partitions(5, 5, 3)
+    partitions(9, 8, 2)
+
+
 def get_data(dir_name):
     """
     usage: get data from imagenet dataset

tests/ut/python/dataset/test_minddataset_sampler.py

@@ -586,6 +586,13 @@ def test_cv_minddataset_split_sharding(add_and_remove_cv_file):
     assert epoch2_dataset not in (epoch1_dataset, epoch3_dataset)
     assert epoch3_dataset not in (epoch1_dataset, epoch2_dataset)
 
+    epoch1_dataset.sort()
+    epoch2_dataset.sort()
+    epoch3_dataset.sort()
+    assert epoch1_dataset != epoch2_dataset
+    assert epoch2_dataset != epoch3_dataset
+    assert epoch3_dataset != epoch1_dataset
+
 
 def get_data(dir_name, sampler=False):
     """