fix MR sampler with replacement case

mindspore/ccsrc/minddata/mindrecord/meta/shard_shuffle.cc

@@ -50,7 +50,7 @@ MSRStatus ShardShuffle::CategoryShuffle(ShardTaskList &tasks) {
     for (uint32_t j = 0; j < individual_size; j++) new_permutations[i][j] = static_cast<int>(j);
     std::shuffle(new_permutations[i].begin(), new_permutations[i].end(), std::default_random_engine(shuffle_seed_));
   }
-  tasks.permutation_.clear();  // Jamie replace this we setting flag to false or something
+  tasks.permutation_.clear();
   for (uint32_t j = 0; j < individual_size; j++) {
     for (uint32_t i = 0; i < tasks.categories; i++) {
       tasks.permutation_.push_back(new_permutations[i][j] * static_cast<int>(tasks.categories) + static_cast<int>(i));
@@ -82,7 +82,6 @@ MSRStatus ShardShuffle::Execute(ShardTaskList &tasks) {
         MS_LOG(ERROR) << "no_of_samples need to be positive.";
         return FAILED;
       }
-      new_tasks.task_list_.reserve(no_of_samples_);
       for (uint32_t i = 0; i < no_of_samples_; ++i) {
         new_tasks.AssignTask(tasks, tasks.GetRandomTaskID());
       }

mindspore/ccsrc/minddata/mindrecord/meta/shard_task_list.cc

@@ -94,7 +94,7 @@ int ShardTaskList::GetTaskSampleByID(size_t id) {
 
 int ShardTaskList::GetRandomTaskID() {
   std::mt19937 gen = mindspore::dataset::GetRandomDevice();
-  std::uniform_int_distribution<> dis(0, task_list_.size() - 1);
+  std::uniform_int_distribution<> dis(0, sample_ids_.size() - 1);
   return dis(gen);
 }