✨ add aggregator

Signed-off-by: peter szemraj <peterszemraj@gmail.com>

aggregate.py

@@ -0,0 +1,118 @@
+# imports
+import logging
+import time
+
+import torch
+from transformers import GenerationConfig, pipeline
+
+# Setting up logging
+logging.basicConfig(
+    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
+)
+
+
+class BatchAggregator:
+    def __init__(
+        self, model_name: str = "pszemraj/bart-large-mnli-dolly_hhrlhf-v1", **kwargs
+    ):
+        self.logger = logging.getLogger(__name__)
+        self.model_name = model_name
+        self.logger.info(f"Initializing aggregator with model {model_name}")
+        self.aggregator = pipeline(
+            "text2text-generation",
+            model_name,
+            device=0 if torch.cuda.is_available() else -1,
+            torch_dtype=torch.float32,
+        )
+
+        try:
+            self.aggregator.model = torch.compile(self.aggregator.model)
+        except Exception as e:
+            self.logger.warning(f"Could not compile model with Torch 2.0: {e}")
+        try:
+            self.aggregator.model.generation_config = GenerationConfig.from_pretrained(
+                self.model_name
+            )
+        except Exception as e:
+            self.logger.warning(
+                f"Could not load generation config, using defaults: {e}"
+            )
+            self.aggregator.model.generation_config = GenerationConfig(
+                num_beams=4,
+                early_stopping=True,
+                do_sample=False,
+                min_new_tokens=32,
+                max_new_tokens=192,
+                repetition_penalty=1.1,
+                length_penalty=1.5,
+                no_repeat_ngram_size=4,
+                encoder_no_repeat_ngram_size=5,
+                decoder_start_token_id=0,
+                eos_token_id=1,
+                pad_token_id=0,
+            )
+
+            if "bart" in model_name.lower():
+                self.logger.info("Using BART model, updating generation config")
+                upd = {
+                    "num_beams": 8,
+                    "repetition_penalty": 1.3,
+                    "length_penalty": 1.0,
+                    "_from_model_config": False,
+                    "max_new_tokens": 256,
+                    "min_new_tokens": 32,
+                    "no_repeat_ngram_size": 3,
+                    "encoder_no_repeat_ngram_size": 6,
+                }
+                self.aggregator.model.generation_config.update(**upd)
+        if self.model_name != "pszemraj/bart-large-mnli-dolly_hhrlhf-v1":
+            self.logger.info("Updating generation config with defaults")
+            self.update_generation_config()
+        self.logger.info(self.aggregator.model.generation_config.to_json_string())
+
+    def update_generation_config(self, **kwargs):
+        self.logger.info(f"Updating generation config with {kwargs}")
+        default = GenerationConfig(
+            num_beams=4,
+            early_stopping=True,
+            do_sample=False,
+            min_new_tokens=32,
+            max_new_tokens=192,
+            repetition_penalty=1.1,
+            length_penalty=1.5,
+            no_repeat_ngram_size=4,
+            encoder_no_repeat_ngram_size=5,
+            decoder_start_token_id=0,
+            eos_token_id=1,
+            pad_token_id=0,
+        ).to_dict()
+        self.aggregator.model.generation_config.update(**default)
+    def _replace_pipeline(model_name)
+    def infer_aggregate(
+        self,
+        text_list: list,
+        instruction: str = "Write a comprehensive yet concise summary in paragraph form that pulls together the main points of the following text:",
+        **kwargs,
+    ):
+        joined_text = "\n".join(text_list)
+        prompt = f"{instruction}\n\n{joined_text}\n"
+        if kwargs:
+            self.update_generation_config(**kwargs)
+        st = time.perf_counter()
+        self.logger.info(f"Running inference on {len(text_list)} texts")
+        result = self.aggregator(
+            prompt,
+            generation_config=self.aggregator.model.generation_config,
+        )[0]["generated_text"]
+        self.logger.info(f"Done. runtime:\t{round(time.perf_counter() - st, 2)}s")
+        self.logger.info(
+            f"Input tokens:\t{self.count_tokens(prompt)}. Output tokens:\t{self.count_tokens(result)}"
+        )
+        return result
+
+    def count_tokens(self, text: str):
+        return (
+            len(self.aggregator.tokenizer.encode(text, truncation=False, padding=False))
+            if text
+            else 0
+        )