BIG Reorganize examples (#4213)

* Created using Colaboratory

* [examples] reorganize files

* remove run_tpu_glue.py as superseded by TPU support in Trainer

* Bugfix: int, not tuple

* move files around

examples/token-classification/test_ner_examples.py

@@ -0,0 +1,33 @@
+import logging
+import sys
+import unittest
+from unittest.mock import patch
+
+import run_ner
+
+
+logging.basicConfig(level=logging.DEBUG)
+
+logger = logging.getLogger()
+
+
+class ExamplesTests(unittest.TestCase):
+    def test_run_ner(self):
+        stream_handler = logging.StreamHandler(sys.stdout)
+        logger.addHandler(stream_handler)
+
+        testargs = """
+            --model_name distilbert-base-german-cased
+            --output_dir ./tests/fixtures/tests_samples/temp_dir
+            --overwrite_output_dir
+            --data_dir ./tests/fixtures/tests_samples/GermEval
+            --labels ./tests/fixtures/tests_samples/GermEval/labels.txt
+            --max_seq_length 128
+            --num_train_epochs 6
+            --logging_steps 1
+            --do_train
+            --do_eval
+            """.split()
+        with patch.object(sys, "argv", ["run.py"] + testargs):
+            result = run_ner.main()
+            self.assertLess(result["loss"], 1.5)