[v1.x] add ONNX DistilBERT tests (#19999)

* add roberta tests

* add distil bert test

tests/python-pytest/onnx/test_onnxruntime.py

@@ -596,8 +596,8 @@ def test_roberta_inference_onnxruntime(tmp_path, model_name):
         onnx_file = "%s.onnx" % prefix
         input_shapes = [(batch, seq_length), (batch,), (batch, num_masked_positions)]
         converted_model_path = mx.contrib.onnx.export_model(sym_file, params_file, input_shapes,
-                                               [np.float32, np.float32, np.int32],
-                                               onnx_file, verbose=True)
+                                                            [np.float32, np.float32, np.int32],
+                                                            onnx_file, verbose=True)
 
         sess_options = onnxruntime.SessionOptions()
         sess_options.graph_optimization_level = onnxruntime.GraphOptimizationLevel.ORT_ENABLE_ALL
@@ -626,11 +626,11 @@ def test_bert_inference_onnxruntime(tmp_path, model):
             name=model,
             ctx=ctx,
             dataset_name=dataset,
-            pretrained=False,
+            pretrained=True,
             use_pooler=True,
             use_decoder=False,
             use_classifier=False)
-        model.initialize(ctx=ctx)
+
         model.hybridize(static_alloc=True)
 
         batch = 5
@@ -669,3 +669,50 @@ def test_bert_inference_onnxruntime(tmp_path, model):
         shutil.rmtree(tmp_path)
 
 
+@with_seed()
+@pytest.mark.parametrize('model_name', ['distilbert_6_768_12'])
+def test_distilbert_inference_onnxruntime(tmp_path, model_name):
+    tmp_path = str(tmp_path)
+    try:
+        import gluonnlp as nlp
+        dataset = 'distilbert_book_corpus_wiki_en_uncased'
+        ctx = mx.cpu(0)
+        model, _ = nlp.model.get_model(
+            name=model_name,
+            ctx=ctx,
+            pretrained=True,
+            dataset_name=dataset)
+
+        model.hybridize(static_alloc=True)
+
+        batch = 2
+        seq_length = 32
+        num_masked_positions = 1
+        inputs = mx.nd.random.uniform(0, 30522, shape=(batch, seq_length), dtype='float32', ctx=ctx)
+        valid_length = mx.nd.array([seq_length] * batch, dtype='float32', ctx=ctx)
+
+        sequence_outputs = model(inputs, valid_length)
+
+        prefix = "%s/distilbert" % tmp_path
+        model.export(prefix)
+        sym_file = "%s-symbol.json" % prefix
+        params_file = "%s-0000.params" % prefix
+        onnx_file = "%s.onnx" % prefix
+
+        input_shapes = [(batch, seq_length), (batch,)]
+        converted_model_path = mx.contrib.onnx.export_model(sym_file, params_file, input_shapes,
+                                                            [np.float32, np.float32],
+                                                            onnx_file, verbose=True)
+        sess_options = onnxruntime.SessionOptions()
+        sess_options.graph_optimization_level = onnxruntime.GraphOptimizationLevel.ORT_ENABLE_ALL
+        sess = onnxruntime.InferenceSession(onnx_file, sess_options)
+
+        in_tensors = [inputs, valid_length]
+        input_dict = dict((sess.get_inputs()[i].name, in_tensors[i].asnumpy()) for i in range(len(in_tensors)))
+        pred = sess.run(None, input_dict)
+
+        assert_almost_equal(sequence_outputs, pred[0])
+
+    finally:
+        shutil.rmtree(tmp_path)
+