Upload dan-chat-advanced.py

dan-chat-advanced.py

@@ -0,0 +1,151 @@
+"""Module containing the PygmalionPromptTokenizingStrategy and PygmalionPrompter class"""
+
+import copy
+import logging
+from collections import defaultdict
+from typing import Generator, List, Tuple, Dict
+
+from axolotl.prompt_tokenizers import (
+    PromptTokenizingStrategy,
+    parse_tokenized_to_result,
+    tokenize_prompt_default,
+)
+
+LOG = logging.getLogger("axolotl")
+
+IGNORE_TOKEN_ID = -100
+
+turn_separator = "\n"
+
+system_prefix = "<|im_start|>system\n"
+user_prefix = "<|im_start|>user\n"
+assistant_prefix = "<|im_start|>assistant\n"
+
+class DanChatMLPromptTokenizingStrategy(PromptTokenizingStrategy):
+    def __init__(self, prompter, tokenizer, train_on_inputs, sequence_len, *args, **kwargs):
+        super().__init__(prompter, tokenizer, *args, **kwargs)
+        
+        res = self._tokenize(assistant_prefix, add_eos_token=False, strip_bos_token=True)
+        self.bot_prefix_token_ids = res["input_ids"]
+        
+        res = self._tokenize(turn_separator, add_eos_token=False, strip_bos_token=True)
+        self.turn_separator_token_ids = res["input_ids"]
+
+        self.train_on_inputs = train_on_inputs
+        self.sequence_len = sequence_len
+
+    def tokenize_prompt(self, prompt):
+        prompt_parts = list(self.prompter.build_prompt(prompt["conversations"]))
+        tokenized_parts = []
+        total_length = 0
+        not_first_turn = False
+        
+        for role, message, loss, prefix in prompt_parts:
+            prefix = prefix or ""
+            message = prefix + message
+            
+            if role in ["system", "user", "human"]:
+                role_prefix = system_prefix if role == "system" else user_prefix
+                res = self._tokenize_with_turn(role_prefix, message, not_first_turn)
+                labels = [IGNORE_TOKEN_ID] * len(res["input_ids"])
+            
+            elif role in ["model", "gpt"]:
+                if not prefix:
+                    res = self._tokenize_with_turn(assistant_prefix, message, not_first_turn)
+                    labels = self._get_labels(res, loss, not_first_turn)
+                else:
+                    res_prefix = self._tokenize_with_turn(assistant_prefix, prefix, not_first_turn, add_eos_token=False)
+                    labels_prefix = [IGNORE_TOKEN_ID] * len(res_prefix["input_ids"])
+                    
+                    res_message = self._tokenize(message.rstrip(), add_eos_token=True, strip_bos_token=True)
+                    labels_message = [*copy.deepcopy(res_message["input_ids"])] if loss else [IGNORE_TOKEN_ID] * len(res_message["input_ids"])
+                    
+                    res = {
+                        "input_ids": res_prefix["input_ids"] + res_message["input_ids"],
+                        "attention_mask": res_prefix["attention_mask"] + res_message["attention_mask"]
+                    }
+                    labels = labels_prefix + labels_message
+            else:
+                LOG.warning(f"unknown role in conversation: {role}")
+                continue
+
+            part_length = len(res["input_ids"])
+            if total_length + part_length > self.sequence_len:
+                break
+
+            tokenized_parts.append({
+                "input_ids": res["input_ids"],
+                "attention_mask": res["attention_mask"],
+                "labels": labels,
+                "role": role,
+                "loss": loss
+            })
+            total_length += part_length
+            not_first_turn = True
+            
+        result = {
+            "input_ids": [],
+            "attention_mask": [],
+            "labels": []
+        }
+
+
+        # Check if the last turn is a human/user/system turn or loss = False
+        while tokenized_parts and (tokenized_parts[-1]["role"] in ["human", "user", "system"] or not tokenized_parts[-1]["loss"]):
+            tokenized_parts.pop()
+
+            
+        # Ensure we have at least one user/human/system turn, if not return
+        if not any(part["role"] in ["human", "user", "system"] for part in tokenized_parts):
+            return result
+            
+        # Ensure we have at least one gpt/model turn, if not return 
+        if not any(part["role"] in ["model", "gpt"] for part in tokenized_parts):
+            return result
+                    
+        # Concatenate the final result
+        for part in tokenized_parts:
+            result["input_ids"] += part["input_ids"]
+            result["attention_mask"] += part["attention_mask"]
+            result["labels"] += part["labels"]
+
+        return result
+    
+    def _tokenize_with_turn(self, role_prefix, message, not_first_turn, add_eos_token=True):
+        full_message = (turn_separator if not_first_turn else "") + role_prefix + message.strip()
+        return self._tokenize(full_message, add_eos_token=add_eos_token, strip_bos_token=not_first_turn)
+
+    def _get_labels(self, res, loss, not_first_turn):
+        if not loss:
+            return [IGNORE_TOKEN_ID] * len(res["input_ids"])
+        
+        prefix_len = len(self.bot_prefix_token_ids + (self.turn_separator_token_ids if not_first_turn else []))
+        return [IGNORE_TOKEN_ID] * prefix_len + [*copy.deepcopy(res["input_ids"])][prefix_len:]
+    
+    
+class DanChatMLPrompter:
+    """
+    Prompter for DanChatML.
+    """
+
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def build_prompt(self, source, *args, **kwargs) -> Generator[Tuple[str, str, bool, str], None, None]:
+        for msg in source:
+            from_value = msg["from"]
+            message_value = msg["value"]
+            
+            # Set loss based on the message source
+            loss = msg.get("loss")
+            if loss is None:
+                loss = True if from_value in ["gpt", "model"] else None
+            
+            # Set prefix, defaulting to an empty string if not present
+            prefix = msg.get("prefix", "")
+            
+            yield from_value, message_value, loss, prefix
+
+
+def load(tokenizer, cfg):
+    return DanChatMLPromptTokenizingStrategy(DanChatMLPrompter(), tokenizer, cfg.train_on_inputs, cfg.sequence_len)