Add Transformerunittest (#12968)

python/paddle/fluid/tests/unittests/test_dist_transformer.py

@@ -15,17 +15,55 @@
 from __future__ import print_function
 
 import unittest
+import paddle
 from test_dist_base import TestDistBase
 
 
-class TestDistTransformer2x2(TestDistBase):
+def download_files():
+    url_prefix = 'http://paddle-unittest-data.cdn.bcebos.com/dist_transformer/'
+    vocab_url = url_prefix + 'vocab.bpe.32000'
+    vocab_md5 = 'a86d345ca6e27f6591d0dccb1b9be853'
+    paddle.dataset.common.download(vocab_url, 'test_dist_transformer',
+                                   vocab_md5)
+
+    local_train_url = url_prefix + 'train.tok.clean.bpe.32000.en-de'
+    local_train_md5 = '033eb02b9449e6dd823f050782ac8914'
+    paddle.dataset.common.download(local_train_url, 'test_dist_transformer',
+                                   local_train_md5)
+
+    train0_url = url_prefix + 'train.tok.clean.bpe.32000.en-de.train_0'
+    train0_md5 = 'ddce7f602f352a0405267285379a38b1'
+    paddle.dataset.common.download(train0_url, 'test_dist_transformer',
+                                   train0_md5)
+
+    train1_url = url_prefix + 'train.tok.clean.bpe.32000.en-de.train_1'
+    train1_md5 = '8757798200180285b1a619cd7f408747'
+    paddle.dataset.common.download(train1_url, 'test_dist_transformer',
+                                   train1_md5)
+
+    test_url = url_prefix + 'newstest2013.tok.bpe.32000.en-de'
+    test_md5 = '9dd74a266dbdb25314183899f269b4a2'
+    paddle.dataset.common.download(test_url, 'test_dist_transformer', test_md5)
+
+
+class TestDistTransformer2x2Sync(TestDistBase):
     def _setup_config(self):
         self._sync_mode = True
 
     def test_transformer(self):
-        # TODO(paddle-dev): check if the delta is OK.
-        # Usually start around ~8000 and converge to ~5000
-        self.check_with_place("dist_transformer.py", delta=400)
+        download_files()
+        #Note: loss on test dataset of the first 5 batch are:
+        # 10.518872, 10.518871, 10.518868, 10.518862, 10.518855
+        self.check_with_place("dist_transformer.py", delta=1e-7)
+
+
+class TestDistTransformer2x2Async(TestDistBase):
+    def _setup_config(self):
+        self._sync_mode = False
+
+    def test_transformer(self):
+        download_files()
+        self.check_with_place("dist_transformer.py", delta=1.0)
 
 
 if __name__ == "__main__":