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197 lines (169 loc) · 6.23 KB
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from typing import (
TYPE_CHECKING,
TypeVar,
Sequence,
List,
Union,
Optional,
Dict,
)
import numpy as np
from docarray import Document, DocumentArray
from docarray.math import ndarray
from docarray.math.helper import EPSILON
from docarray.math.ndarray import to_numpy_array
from docarray.score import NamedScore
from docarray.array.mixins.find import FindMixin as BaseFindMixin
if TYPE_CHECKING: # pragma: no cover
import tensorflow
import torch
OpenSearchArrayType = TypeVar(
'OpenSearchArrayType',
np.ndarray,
tensorflow.Tensor,
torch.Tensor,
Sequence[float],
Dict,
)
class FindMixin(BaseFindMixin):
def _find_similar_vectors(
self,
query: 'OpenSearchArrayType',
filter: Optional[Dict] = None,
limit=10,
**kwargs,
):
"""
Return vector search results for the input query. `script_score` will be used in filter_field is set.
:param query: query vector used for vector search
:param filter: filter query used for post-filtering
:param limit: number of items to be retrieved
:return: DocumentArray containing the closest documents to the query if it is a single query, otherwise a list of DocumentArrays containing
the closest Document objects for each of the queries in `query`.
"""
query = to_numpy_array(query)
is_all_zero = np.all(query == 0)
if is_all_zero:
query = query + EPSILON
filter_query = {'match_all': {}}
if filter:
filter_query = {'bool': {'filter': filter}}
knn_query = {
'size': limit,
'query': {
'script_score': {
'query': filter_query,
'script': {
'lang': 'knn',
'source': 'knn_score',
'params': {
'field': 'embedding',
'query_value': query,
'space_type': self._get_distance_metric(
kwargs.get('distance')
),
},
},
}
},
}
resp = self._client.search(index=self._config.index_name, body=knn_query)
list_of_hits = resp['hits']['hits']
da = DocumentArray()
for result in list_of_hits:
doc = Document.from_base64(result['_source']['blob'])
doc.scores['score'] = NamedScore(value=result['_score'])
doc.embedding = result['_source']['embedding']
da.append(doc)
return da
def _get_distance_metric(self, distance=None):
return distance if distance else self._config.distance
def _find_similar_documents_from_text(
self,
query: str,
index: str = 'text',
filter: Union[dict, list] = None,
limit: int = 10,
):
"""
Return keyword matches for the input query
:param query: text used for keyword search
:param limit: number of items to be retrieved
:return: DocumentArray containing the closest documents to the query if it is a single query, otherwise a list of DocumentArrays containing
the closest Document objects for each of the queries in `query`.
"""
query = {
'_source': ['id', 'blob', 'text'],
'size': limit,
'query': {
"bool": {
"must": [
{"match": {index: query}},
],
'filter': filter,
}
},
}
resp = self._client.search(index=self._config.index_name, body=query)
list_of_hits = resp['hits']['hits']
da = DocumentArray()
for result in list_of_hits[:limit]:
doc = Document.from_base64(result['_source']['blob'])
doc.scores['score'] = NamedScore(value=result['_score'])
da.append(doc)
return da
def _find_by_text(
self,
query: Union[str, List[str]],
index: str = 'text',
filter: Union[dict, list] = None,
limit: int = 10,
):
if isinstance(query, str):
query = [query]
return [
self._find_similar_documents_from_text(
q,
index=index,
filter=filter,
limit=limit,
)
for q in query
]
def _find(
self,
query: 'OpenSearchArrayType',
limit: int = 10,
filter: Optional[Dict] = None,
**kwargs,
) -> List['DocumentArray']:
"""Returns approximate nearest neighbors given a batch of input queries.
:param query: input supported to be stored in OpenSearch. This includes any from the list '[np.ndarray, tensorflow.Tensor, torch.Tensor, Sequence[float]]'
:param limit: number of retrieved items
:param filter: filter query used for pre-filtering
:return: DocumentArray containing the closest documents to the query if it is a single query, otherwise a list of DocumentArrays containing
the closest Document objects for each of the queries in `query`.
"""
query = np.array(query).astype(np.float32)
num_rows, n_dim = ndarray.get_array_rows(query)
if n_dim != 2:
query = query.reshape((num_rows, -1))
return [
self._find_similar_vectors(q, filter=filter, limit=limit, **kwargs)
for q in query
]
def _find_with_filter(self, query: Dict, limit: Optional[Union[int, float]] = 20):
resp = self._client.search(
index=self._config.index_name, body={'query': query, 'size': limit}
)
list_of_hits = resp['hits']['hits']
da = DocumentArray()
for result in list_of_hits[:limit]:
doc = Document.from_base64(result['_source']['blob'])
doc.scores['score'] = NamedScore(value=result['_score'])
da.append(doc)
return da
def _filter(
self, query: Dict, limit: Optional[Union[int, float]] = 20
) -> 'DocumentArray':
return self._find_with_filter(query, limit=limit)