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schema.py
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/
schema.py
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"""Base schema for data structures."""
import uuid
from abc import abstractmethod
from enum import Enum, auto
from hashlib import sha256
from pydantic import BaseModel, Field, root_validator
from typing import Any, Dict, List, Optional, Union
from llama_index.bridge.langchain import Document as LCDocument
from llama_index.utils import SAMPLE_TEXT
DEFAULT_TEXT_NODE_TMPL = "{metadata_str}\n\n{content}"
DEFAULT_METADATA_TMPL = "{key}: {value}"
class NodeRelationship(str, Enum):
"""Node relationships used in `BaseNode` class.
Attributes:
SOURCE: The node is the source document.
PREVIOUS: The node is the previous node in the document.
NEXT: The node is the next node in the document.
PARENT: The node is the parent node in the document.
CHILD: The node is a child node in the document.
"""
SOURCE = auto()
PREVIOUS = auto()
NEXT = auto()
PARENT = auto()
CHILD = auto()
class ObjectType(str, Enum):
TEXT = auto()
IMAGE = auto()
INDEX = auto()
DOCUMENT = auto()
class MetadataMode(str, Enum):
ALL = auto()
EMBED = auto()
LLM = auto()
NONE = auto()
class RelatedNodeInfo(BaseModel):
node_id: str
node_type: Optional[ObjectType] = None
metadata: Dict[str, Any] = Field(default_factory=dict)
hash: Optional[str] = None
RelatedNodeType = Union[RelatedNodeInfo, List[RelatedNodeInfo]]
# Node classes for indexes
class BaseNode(BaseModel):
"""Base node Object.
Generic abstract interface for retrievable nodes
"""
class Config:
allow_population_by_field_name = True
id_: str = Field(
default_factory=lambda: str(uuid.uuid4()), description="Unique ID of the node."
)
embedding: Optional[List[float]] = Field(
default=None, description="Embedding of the node."
)
""""
metadata fields
- injected as part of the text shown to LLMs as context
- injected as part of the text for generating embeddings
- used by vector DBs for metadata filtering
"""
metadata: Dict[str, Any] = Field(
default_factory=dict,
description="A flat dictionary of metadata fields",
alias="extra_info",
)
excluded_embed_metadata_keys: List[str] = Field(
default_factory=list,
description="Metadata keys that are exluded from text for the embed model.",
)
excluded_llm_metadata_keys: List[str] = Field(
default_factory=list,
description="Metadata keys that are exluded from text for the LLM.",
)
relationships: Dict[NodeRelationship, RelatedNodeType] = Field(
default_factory=dict,
description="A mapping of relationships to other node information.",
)
hash: str = Field(default="", description="Hash of the node content.")
@classmethod
@abstractmethod
def get_type(cls) -> str:
"""Get Object type."""
@abstractmethod
def get_content(self, metadata_mode: MetadataMode = MetadataMode.ALL) -> str:
"""Get object content."""
@abstractmethod
def get_metadata_str(self, mode: MetadataMode = MetadataMode.ALL) -> str:
"""Metadata string."""
@abstractmethod
def set_content(self, value: Any) -> None:
"""Set the content of the node."""
@property
def node_id(self) -> str:
return self.id_
@property
def source_node(self) -> Optional[RelatedNodeInfo]:
"""Source object node.
Extracted from the relationships field.
"""
if NodeRelationship.SOURCE not in self.relationships:
return None
relation = self.relationships[NodeRelationship.SOURCE]
if isinstance(relation, list):
raise ValueError("Source object must be a single RelatedNodeInfo object")
return relation
@property
def prev_node(self) -> Optional[RelatedNodeInfo]:
"""Prev node."""
if NodeRelationship.PREVIOUS not in self.relationships:
return None
relation = self.relationships[NodeRelationship.PREVIOUS]
if not isinstance(relation, RelatedNodeInfo):
raise ValueError("Previous object must be a single RelatedNodeInfo object")
return relation
@property
def next_node(self) -> Optional[RelatedNodeInfo]:
"""Next node."""
if NodeRelationship.NEXT not in self.relationships:
return None
relation = self.relationships[NodeRelationship.NEXT]
if not isinstance(relation, RelatedNodeInfo):
raise ValueError("Next object must be a single RelatedNodeInfo object")
return relation
@property
def parent_node(self) -> Optional[RelatedNodeInfo]:
"""Parent node."""
if NodeRelationship.PARENT not in self.relationships:
return None
relation = self.relationships[NodeRelationship.PARENT]
if not isinstance(relation, RelatedNodeInfo):
raise ValueError("Parent object must be a single RelatedNodeInfo object")
return relation
@property
def child_nodes(self) -> Optional[List[RelatedNodeInfo]]:
"""Child nodes."""
if NodeRelationship.CHILD not in self.relationships:
return None
relation = self.relationships[NodeRelationship.PARENT]
if not isinstance(relation, list):
raise ValueError("Child objects must be a list of RelatedNodeInfo objects.")
return relation
@property
def ref_doc_id(self) -> Optional[str]:
"""Deprecated: Get ref doc id."""
source_node = self.source_node
if source_node is None:
return None
return source_node.node_id
@property
def extra_info(self) -> Dict[str, Any]:
"""TODO: DEPRECATED: Extra info."""
return self.metadata
def get_embedding(self) -> List[float]:
"""Get embedding.
Errors if embedding is None.
"""
if self.embedding is None:
raise ValueError("embedding not set.")
return self.embedding
def as_related_node_info(self) -> RelatedNodeInfo:
"""Get node as RelatedNodeInfo."""
return RelatedNodeInfo(
node_id=self.node_id, metadata=self.metadata, hash=self.hash
)
class TextNode(BaseNode):
text: str = Field(default="", description="Text content of the node.")
start_char_idx: Optional[int] = Field(
default=None, description="Start char index of the node."
)
end_char_idx: Optional[int] = Field(
default=None, description="End char index of the node."
)
text_template: str = Field(
default=DEFAULT_TEXT_NODE_TMPL,
description=(
"Template for how text is formatted, with {content} and "
"{metadata_str} placeholders."
),
)
metadata_template: str = Field(
default=DEFAULT_METADATA_TMPL,
description=(
"Template for how metadata is formatted, with {key} and "
"{value} placeholders."
),
)
metadata_seperator: str = Field(
default="\n",
description="Seperator between metadata fields when converting to string.",
)
@root_validator
def _check_hash(cls, values: dict) -> dict:
"""Generate a hash to represent the node."""
text = values.get("text", "")
metadata = values.get("metadata", {})
doc_identity = str(text) + str(metadata)
values["hash"] = str(
sha256(doc_identity.encode("utf-8", "surrogatepass")).hexdigest()
)
return values
@classmethod
def get_type(cls) -> str:
"""Get Object type."""
return ObjectType.TEXT
def get_content(self, metadata_mode: MetadataMode = MetadataMode.NONE) -> str:
"""Get object content."""
metadata_str = self.get_metadata_str(mode=metadata_mode).strip()
return self.text_template.format(
content=self.text, metadata_str=metadata_str
).strip()
def get_metadata_str(self, mode: MetadataMode = MetadataMode.ALL) -> str:
"""metadata info string."""
if mode == MetadataMode.NONE:
return ""
usable_metadata_keys = set(self.metadata.keys())
if mode == MetadataMode.LLM:
for key in self.excluded_llm_metadata_keys:
if key in usable_metadata_keys:
usable_metadata_keys.remove(key)
elif mode == MetadataMode.EMBED:
for key in self.excluded_embed_metadata_keys:
if key in usable_metadata_keys:
usable_metadata_keys.remove(key)
return self.metadata_seperator.join(
[
self.metadata_template.format(key=key, value=str(value))
for key, value in self.metadata.items()
if key in usable_metadata_keys
]
)
def set_content(self, value: str) -> None:
"""Set the content of the node."""
self.text = value
def get_node_info(self) -> Dict[str, Any]:
"""Get node info."""
return {"start": self.start_char_idx, "end": self.end_char_idx}
def get_text(self) -> str:
return self.get_content(metadata_mode=MetadataMode.NONE)
@property
def node_info(self) -> Dict[str, Any]:
"""Deprecated: Get node info."""
return self.get_node_info()
# TODO: legacy backport of old Node class
Node = TextNode
class ImageNode(TextNode):
"""Node with image."""
# TODO: store reference instead of actual image
# base64 encoded image str
image: Optional[str] = None
@classmethod
def get_type(cls) -> str:
return ObjectType.IMAGE
class IndexNode(TextNode):
"""Node with reference to an index."""
index_id: str
@classmethod
def get_type(cls) -> str:
return ObjectType.INDEX
class NodeWithScore(BaseModel):
node: BaseNode
score: Optional[float] = None
# Document Classes for Readers
class Document(TextNode):
"""Generic interface for a data document.
This document connects to data sources.
"""
# TODO: A lot of backwards compatibility logic here, clean up
id_: str = Field(
default_factory=lambda: str(uuid.uuid4()),
description="Unique ID of the node.",
alias="doc_id",
)
_compat_fields = {"doc_id": "id_", "extra_info": "metadata"}
@classmethod
def get_type(cls) -> str:
"""Get Document type."""
return ObjectType.DOCUMENT
@property
def doc_id(self) -> str:
"""Get document ID."""
return self.id_
def get_doc_id(self) -> str:
"""TODO: Deprecated: Get document ID."""
return self.id_
def __setattr__(self, name: str, value: object) -> None:
if name in self._compat_fields:
name = self._compat_fields[name]
super().__setattr__(name, value)
def to_langchain_format(self) -> LCDocument:
"""Convert struct to LangChain document format."""
metadata = self.metadata or {}
return LCDocument(page_content=self.text, metadata=metadata)
@classmethod
def from_langchain_format(cls, doc: LCDocument) -> "Document":
"""Convert struct from LangChain document format."""
return cls(text=doc.page_content, metadata=doc.metadata)
@classmethod
def example(cls) -> "Document":
document = Document(
text=SAMPLE_TEXT,
metadata={"filename": "README.md", "category": "codebase"},
)
return document
class ImageDocument(Document):
"""Data document containing an image."""
# base64 encoded image str
image: Optional[str] = None