Custom inference code for SageMaker deployment (#9)

- Custom inference code for aws (a211030719303b038c551e8378aeb0c21ea4c79f)

code/inference.py

@@ -0,0 +1,24 @@
+from transformers import AutoModelForSequenceClassification, AutoTokenizer, pipeline
+
+
+def model_fn(model_dir):
+    """
+    Load the model and tokenizer from the specified paths
+    :param model_dir:
+    :return:
+    """
+    tokenizer = AutoTokenizer.from_pretrained(model_dir)
+    model = AutoModelForSequenceClassification.from_pretrained(model_dir)
+    return model, tokenizer
+
+
+def predict_fn(data, model_and_tokenizer):
+    # destruct model and tokenizer
+    model, tokenizer = model_and_tokenizer
+
+    bert_pipe = pipeline("text-classification", model=model, tokenizer=tokenizer,
+                         truncation=True, max_length=512, return_all_scores=True)
+    # Tokenize the input, pick up first 512 tokens before passing it further
+    tokens = tokenizer.encode(data['inputs'], add_special_tokens=False, max_length=512, truncation=True)
+    input_data = tokenizer.decode(tokens)
+    return bert_pipe(input_data)