adding handler.py

handler.py

@@ -0,0 +1,69 @@
+import logging
+from typing import Dict, List, Any
+from transformers import AutoTokenizer, AutoModelForCausalLM, pipeline, StoppingCriteria, StoppingCriteriaList
+
+# Configure logging
+logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
+
+class EndpointHandler():
+    def __init__(self, path=""):
+        logging.info("Initializing EndpointHandler with model path: %s", path)
+        tokenizer = AutoTokenizer.from_pretrained(path)
+        tokenizer.pad_token = tokenizer.eos_token
+        self.model = AutoModelForCausalLM.from_pretrained(path)
+        self.tokenizer = tokenizer
+        self.stopping_criteria = StoppingCriteriaList([StopAtPeriodCriteria(tokenizer)])
+
+    def __call__(self, data: Dict[str, Any]) -> List[Dict[str, Any]]:
+        logging.info("Starting inference")
+        inputs = data.pop("inputs", data)
+        additional_bad_words_ids = data.pop("additional_bad_words_ids", [])
+        
+        # Log the input size
+        logging.info("Encoding inputs")
+        input_ids = self.tokenizer.encode(inputs, return_tensors="pt")
+        logging.info("Input IDs shape: %s", input_ids.shape)
+
+        max_generation_length = 75  # Desired number of tokens to generate
+        max_input_length = 4092 - max_generation_length  # Maximum input length to allow space for generation
+
+        # 3070, 10456, [313, 334], [29898, 1068] corresponds to "(*", and we do not want to output a comment
+        # 13 is a newline character
+        # [1976, 441, 29889], [4920, 441, 29889] is "Abort." [4920, 18054, 29889] is "Aborted."
+        # [2087, 29885, 4430, 29889], [3253, 29885, 4430, 29889] is "Admitted."
+        # [3253, 29885, 4430, 29889]
+        bad_words_ids = [[3070], [313, 334], [10456], [13], [1976, 441, 29889], [2087, 29885, 4430, 29889], [4920, 441], [4920, 441, 29889], [4920, 18054, 29889], [29898, 1068], [3253, 29885, 4430, 29889]]
+        bad_words_ids.extend(additional_bad_words_ids)
+
+        # Truncation and generation logging
+        if input_ids.shape[1] > max_input_length:
+            logging.info("Truncating input IDs to fit within max input length")
+            input_ids = input_ids[:, -max_input_length:]
+
+        max_length = input_ids.shape[1] + max_generation_length
+        
+        logging.info("Generating output")
+        generated_ids = self.model.generate(
+            input_ids,
+            max_length=max_length,
+            bad_words_ids=bad_words_ids,
+            temperature=0.5,
+            top_k=40,
+            do_sample=True,
+            stopping_criteria=self.stopping_criteria,
+        )
+        logging.info("Finished generating output")
+
+        generated_text = self.tokenizer.decode(generated_ids[0][input_ids.shape[1]:], skip_special_tokens=True)
+        prediction = [{"generated_text": generated_text, "generated_ids": generated_ids[0][input_ids.shape[1]:].tolist()}]
+        logging.info("Inference complete")
+        return prediction
+
+class StopAtPeriodCriteria(StoppingCriteria):
+    def __init__(self, tokenizer):
+        self.tokenizer = tokenizer
+
+    def __call__(self, input_ids, scores, **kwargs):
+        last_token_text = self.tokenizer.decode(input_ids[:, -1], skip_special_tokens=True)
+        logging.info("StopAtPeriodCriteria called. Last token text: '%s'", last_token_text)
+        return '.' in last_token_text