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Model: llm-jp/llm-jp-4-8b-base
Source: Original Platform

llmjp4_harmony.py

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+# Generic parser for OpenAI Harmony format.
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import Iterator, Sequence
+
+from transformers import PreTrainedTokenizerBase as TokenizerLike
+
+
+class HarmonyMessageEndType(Enum):
+    INCOMPLETE = 0
+    END = 1
+    CALL = 2
+
+
+@dataclass(frozen=True)
+class HarmonySequence:
+    """A data class representing a sequence of tokens in the Harmony format."""
+    token_ids: list[int]
+    start: int  # Start position of the sequence in the original token sequence
+
+
+@dataclass(frozen=True)
+class HarmonyMessage:
+    """A data class representing a message in the Harmony format."""
+    end: HarmonyMessageEndType
+    role: HarmonySequence | None = None
+    channel: HarmonySequence | None = None
+    constrain: HarmonySequence | None = None
+    content: HarmonySequence | None = None
+
+
+class HarmonyMessageParser:
+    """A parser that performs lexical analysis to extract Harmony messages."""
+
+    def __init__(self, tokenizer: TokenizerLike):
+        vocab = tokenizer.get_vocab()
+        self._begin_map = {
+            vocab["<|start|>"]: "role",
+            vocab["<|channel|>"]: "channel",
+            vocab["<|constrain|>"]: "constrain",
+            vocab["<|message|>"]: "content",
+        }
+        self._end_map = {
+            vocab["<|end|>"]: HarmonyMessageEndType.END,
+            vocab["<|return|>"]: HarmonyMessageEndType.END,
+            vocab["<|call|>"]: HarmonyMessageEndType.CALL,
+        }
+
+    def iter_messages(self, token_ids: Sequence[int]) -> Iterator[HarmonyMessage]:
+        """
+        Parse given token ids into messages.
+
+        Args:
+            token_ids: A sequence of token ids to be parsed.
+        
+        Yields:
+            Detected HarmonyMessages.
+        """
+
+        message_dict: dict[str, HarmonySequence] = {}
+        section: str | None = None  # None indicates out-of-message.
+        text_ids: list[int] = []
+        text_start: int | None = None
+
+        for token_position, token_id in enumerate(token_ids):
+            if token_id in self._begin_map:
+                if section is not None:
+                    message_dict[section] = HarmonySequence(
+                        token_ids=text_ids,
+                        start=text_start,
+                    )
+                section = self._begin_map[token_id]
+                text_ids = []
+                text_start = token_position + 1
+
+            elif token_id in self._end_map:
+                if section is not None:
+                    message_dict[section] = HarmonySequence(
+                        token_ids=text_ids,
+                        start=text_start,
+                    )
+
+                yield HarmonyMessage(**message_dict, end=self._end_map[token_id])
+
+                message_dict = {}
+                section = None
+                text_ids = []
+                text_start = None
+    
+            else:
+                if section is not None:
+                    text_ids.append(token_id)
+        
+        if section is not None:
+            message_dict[section] = HarmonySequence(
+                token_ids=text_ids,
+                start=text_start,
+            )
+            yield HarmonyMessage(**message_dict, end=HarmonyMessageEndType.INCOMPLETE)
+
+    def get_all_messages(self, token_ids: Sequence[int]) -> list[HarmonyMessage]:
+        """
+        Parse given token ids into messages.
+
+        Args:
+            token_ids: A sequence of token ids to be parsed.
+        
+        Returns:
+            A list of detected HarmonyMessages.
+        """
+        return list(self.iter_messages(token_ids))
+    
+    def reverse_iter_messages(self, token_ids: Sequence[int]) -> Iterator[HarmonyMessage]:
+        """
+        Parse given token ids into messages in reverse order.
+
+        Args:
+            token_ids: A sequence of token ids to be parsed.
+        
+        Yields:
+            Detected HarmonyMessages in reverse order.
+        """
+        end_position = len(token_ids)
+
+        for i in range(len(token_ids) - 1, -1, -1):
+            if token_ids[i] == self._start_id:
+                yield next(self.iter_messages(token_ids[i:end_position]))
+                end_position = i