change speed to ips (#4935)

average reader cost; test=develop

dygraph/seq2seq/train.py

@@ -158,11 +158,13 @@ def main():
             total_loss = 0
             word_count = 0.0
             batch_times = []
+            total_reader_cost = 0.0
             interval_time_start = time.time()
 
             batch_start = time.time()
             for batch_id, batch in enumerate(train_data_iter):
                 batch_reader_end = time.time()
+                total_reader_cost += batch_reader_end - batch_start
 
                 input_data_feed, word_num = prepare_input(
                     batch, epoch_id=epoch_id)
@@ -178,14 +180,15 @@ def main():
                 batch_times.append(train_batch_cost)
                 if batch_id > 0 and batch_id % 100 == 0:
                     print(
-                        "-- Epoch:[%d]; Batch:[%d]; ppl: %.5f, batch_cost: %.5f s, reader_cost: %.5f s, speed: %.5f words/s"
+                        "-- Epoch:[%d]; Batch:[%d]; ppl: %.5f, batch_cost: %.5f s, reader_cost: %.5f s, ips: %.5f words/s"
                         % (epoch_id, batch_id, np.exp(total_loss.numpy() /
                                                       word_count),
-                           train_batch_cost, batch_reader_end - batch_start,
+                           train_batch_cost, total_reader_cost / 100,
                            word_count / (time.time() - interval_time_start)))
                     ce_ppl.append(np.exp(total_loss.numpy() / word_count))
                     total_loss = 0.0
                     word_count = 0.0
+                    total_reader_cost = 0.0
                     interval_time_start = time.time()
                 batch_start = time.time()