fix: MindDataset padded log error

mindspore/ccsrc/mindrecord/include/shard_distributed_sample.h

@@ -40,6 +40,8 @@ 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
 };
 }  // namespace mindrecord
 }  // namespace mindspore

mindspore/ccsrc/mindrecord/meta/shard_distributed_sample.cc

@@ -24,7 +24,10 @@ namespace mindspore {
 namespace mindrecord {
 ShardDistributedSample::ShardDistributedSample(int num_shards, int shard_id, int no_of_padded_samples, bool shuffle,
                                                uint32_t seed)
-    : ShardSample(1, num_shards, shard_id), shuffle_(shuffle), no_of_padded_samples_(no_of_padded_samples) {
+    : ShardSample(1, num_shards, shard_id),
+      shuffle_(shuffle),
+      no_of_padded_samples_(no_of_padded_samples),
+      init_judgment_(false) {
   shuffle_op_ = std::make_shared<ShardShuffle>(seed, kShuffleSample);
 }
 
@@ -45,11 +48,15 @@ int64_t ShardDistributedSample::GetNumSamples(int64_t dataset_size, int64_t num_
   }
   return 0;
 }
+
 MSRStatus ShardDistributedSample::PreExecute(ShardTask &tasks) {
   auto total_no = tasks.Size();
-  if (no_of_padded_samples_ > 0) {
+  if (no_of_padded_samples_ > 0 && init_judgment_ == false) {  // we only judge this in first time
+    init_judgment_ = true;
     if (total_no % denominator_ != 0) {
-      MS_LOG(ERROR) << "Dataset size plus number of padded samples is not divisible by number of shards.";
+      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_
+                    << ", denominator: " << denominator_;
       return FAILED;
     }
   }

tests/ut/python/dataset/test_minddataset_padded.py

@@ -120,7 +120,7 @@ def test_cv_minddataset_reader_basic_padded_samples(add_and_remove_cv_file):
             assert item['label'] == padded_sample['label']
             assert (item['data'] == np.array(list(padded_sample['data']))).all()
         num_iter += 1 
-    assert num_padded_iter ==5
+    assert num_padded_iter == 5
     assert num_iter == 15
 
 
@@ -135,6 +135,8 @@ def test_cv_minddataset_partition_padded_samples(add_and_remove_cv_file):
     num_readers = 4
 
     def partitions(num_shards, num_padded, dataset_size):
+        num_padded_iter = 0
+        num_iter = 0
         for partition_id in range(num_shards):
             data_set = ds.MindDataset(CV_FILE_NAME + "0", columns_list, num_readers,
                                       num_shards=num_shards,
@@ -142,8 +144,6 @@ def test_cv_minddataset_partition_padded_samples(add_and_remove_cv_file):
                                       padded_sample=padded_sample,
                                       num_padded=num_padded)
             assert data_set.get_dataset_size() == dataset_size
-            num_iter = 0
-            num_padded_iter = 0
             for item in data_set.create_dict_iterator():
                 logger.info("-------------- partition : {} ------------------------".format(partition_id))
                 logger.info("-------------- len(item[data]): {} ------------------------".format(len(item["data"])))
@@ -156,11 +156,53 @@ def test_cv_minddataset_partition_padded_samples(add_and_remove_cv_file):
                     assert item['label'] == padded_sample['label']
                     assert (item['data'] == np.array(list(padded_sample['data']))).all()
                 num_iter += 1
-        return num_iter
+        assert num_padded_iter == num_padded
+        return num_iter == dataset_size * num_shards
+
+    partitions(4, 2, 3)
+    partitions(5, 5, 3)
+    partitions(9, 8, 2)
+
+def test_cv_minddataset_partition_padded_samples_multi_epoch(add_and_remove_cv_file):
+    """tutorial for cv minddataset."""
+    columns_list = ["data", "file_name", "label"]
+
+    data = get_data(CV_DIR_NAME)
+    padded_sample = data[0]
+    padded_sample['label'] = -2
+    padded_sample['file_name'] = 'dummy.jpg'
+    num_readers = 4
+
+    def partitions(num_shards, num_padded, dataset_size):
+        repeat_size = 5
+        num_padded_iter = 0
+        num_iter = 0
+        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,
+                                      padded_sample=padded_sample,
+                                      num_padded=num_padded)
+            assert data_set.get_dataset_size() == dataset_size
+            data_set = data_set.repeat(repeat_size)
+            for item in data_set.create_dict_iterator():
+                logger.info("-------------- partition : {} ------------------------".format(partition_id))
+                logger.info("-------------- len(item[data]): {} ------------------------".format(len(item["data"])))
+                logger.info("-------------- item[data]: {} -----------------------------".format(item["data"]))
+                logger.info("-------------- item[file_name]: {} ------------------------".format(item["file_name"]))
+                logger.info("-------------- item[label]: {} -----------------------".format(item["label"]))
+                if item['label'] == -2:
+                    num_padded_iter += 1
+                    assert item['file_name'] == bytes(padded_sample['file_name'], encoding='utf8')
+                    assert item['label'] == padded_sample['label']
+                    assert (item['data'] == np.array(list(padded_sample['data']))).all()
+                num_iter += 1
+        assert num_padded_iter == num_padded * repeat_size
+        assert num_iter == dataset_size * num_shards * repeat_size
 
-    assert partitions(4, 2, 3) == 3
-    assert partitions(5, 5, 3) == 3
-    assert partitions(9, 8, 2) == 2
+    partitions(4, 2, 3)
+    partitions(5, 5, 3)
+    partitions(9, 8, 2)
 
 def test_cv_minddataset_partition_padded_samples_no_dividsible(add_and_remove_cv_file):
     """tutorial for cv minddataset."""
@@ -308,6 +350,8 @@ def test_nlp_minddataset_reader_basic_padded_samples(add_and_remove_nlp_file):
     num_readers = 4
 
     def partitions(num_shards, num_padded, dataset_size):
+        num_padded_iter = 0
+        num_iter = 0
         for partition_id in range(num_shards):
             data_set = ds.MindDataset(NLP_FILE_NAME + "0", columns_list, num_readers,
                                       num_shards=num_shards,
@@ -315,22 +359,61 @@ def test_nlp_minddataset_reader_basic_padded_samples(add_and_remove_nlp_file):
                                       padded_sample=padded_sample,
                                       num_padded=num_padded)
             assert data_set.get_dataset_size() == dataset_size
-            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'] == '-1':
+                if item['id'] == bytes('-1', encoding='utf-8'):
                     num_padded_iter += 1
-                    assert item['id'] == padded_sample['id']
-                    assert item['input_ids'] == padded_sample['input_ids']
-                    assert item['rating'] == padded_sample['rating']
+                    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()
                 num_iter += 1
-        return num_iter
+        assert num_padded_iter == num_padded
+        assert num_iter == dataset_size * num_shards
+
+    partitions(4, 6, 4)
+    partitions(5, 5, 3)
+    partitions(9, 8, 2)
+
+def test_nlp_minddataset_reader_basic_padded_samples_multi_epoch(add_and_remove_nlp_file):
+    columns_list = ["input_ids", "id", "rating"]
+
+    data = [x for x in get_nlp_data(NLP_FILE_POS, NLP_FILE_VOCAB, 10)]
+    padded_sample = data[0]
+    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
+        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)
+            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()
+                num_iter += 1
+        assert num_padded_iter == num_padded * repeat_size
+        assert num_iter == dataset_size * num_shards * repeat_size
 
-    assert partitions(4, 6, 4) == 4
-    assert partitions(5, 5, 3) == 3
-    assert partitions(9, 8, 2) == 2
+    partitions(4, 6, 4)
+    partitions(5, 5, 3)
+    partitions(9, 8, 2)
 
 def get_data(dir_name):
     """