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class API(Application):
    “””
    Base API template. The API is an extended txtai application, adding the ability to cluster API instances together.
    Downstream applications can extend this base template to add/modify functionality.
    “””
    def init(self, config, loaddata=True):
        super().init(config, loaddata)
        # Embeddings cluster
        self.cluster = None
        if self.config.get(“cluster”):
            self.cluster = Cluster(self.config[“cluster”])
    # pylint: disable=W0221
    def search(self, query, limit=None, weights=None, index=None, request=None):
        # When search is invoked via the API, limit is set from the request
        # When search is invoked directly, limit is set using the method parameter
        limit = self.limit(request.query_params.get(“limit”) if request and hasattr(request, “query_params”) else limit)
        weights = self.weights(request.query_params.get(“weights”) if request and hasattr(request, “query_params”) else weights)
        index = request.query_params.get(“index”) if request and hasattr(request, “query_params”) else index
        if self.cluster:
            return self.cluster.search(query, limit, weights, index)
        return super().search(query, limit, weights, index)
    def batchsearch(self, queries, limit=None, weights=None, index=None):
        if self.cluster:
            return self.cluster.batchsearch(queries, self.limit(limit), weights, index)
        return super().batchsearch(queries, limit, weights, index)
    def add(self, documents):
        “””
        Adds a batch of documents for indexing.
        Downstream applications can override this method to also store full documents in an external system.
        Args:
            documents: list of {id: value, text: value}
        Returns:
            unmodified input documents
        “””
        if self.cluster:
            self.cluster.add(documents)
        else:
            super().add(documents)
        return documents
    def index(self):
        “””
        Builds an embeddings index for previously batched documents.
        “””
        if self.cluster:
            self.cluster.index()
        else:
            super().index()
    def upsert(self):
        “””
        Runs an embeddings upsert operation for previously batched documents.
        “””
        if self.cluster:
            self.cluster.upsert()
        else:
            super().upsert()
    def delete(self, ids):
        “””
        Deletes from an embeddings index. Returns list of ids deleted.
        Args:
            ids: list of ids to delete
        Returns:
            ids deleted
        “””
        if self.cluster:
            return self.cluster.delete(ids)
        return super().delete(ids)
    def reindex(self, config, function=None):
        “””
        Recreates this embeddings index using config. This method only works if document content storage is enabled.
        Args:
            config: new config
            function: optional function to prepare content for indexing
        “””
        if self.cluster:
            self.cluster.reindex(config, function)
        else:
            super().reindex(config, function)
    def count(self):
        “””
        Total number of elements in this embeddings index.
        Returns:
            number of elements in embeddings index
        “””
        if self.cluster:
            return self.cluster.count()
        return super().count()
    def limit(self, limit):
        “””
        Parses the number of results to return from the request. Allows range of 1-250, with a default of 10.
        Args:
            limit: limit parameter
        Returns:
            bounded limit
        “””
        # Return between 1 and 250 results, defaults to 10
        return max(1, min(250, int(limit) if limit else 10))
    def weights(self, weights):
        “””
        Parses the weights parameter from the request.
        Args:
            weights: weights parameter
        Returns:
            weights
        “””
        return float(weights) if weights else weights

list of {id: value, text: value}

unmodified input documents

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def add(self, documents):
    “””
    Adds a batch of documents for indexing.
    Downstream applications can override this method to also store full documents in an external system.
    Args:
        documents: list of {id: value, text: value}
    Returns:
        unmodified input documents
    “””
    if self.cluster:
        self.cluster.add(documents)
    else:
        super().add(documents)
    return documents

queries text

optional list of text, otherwise runs search queries

optional limit if texts is None

list of dict per input text per query where a higher token scores represents higher importance relative to the query

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def batchexplain(self, queries, texts=None, limit=10):
    “””
    Explains the importance of each input token in text for a list of queries.
    Args:
        query: queries text
        texts: optional list of text, otherwise runs search queries
        limit: optional limit if texts is None
    Returns:
        list of dict per input text per query where a higher token scores represents higher importance relative to the query
    “””
    if self.embeddings:
        with self.lock:
            return self.embeddings.batchexplain(queries, texts, limit)
    return None

queries text

list of text

list of {id: value, score: value} per query

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def batchsimilarity(self, queries, texts):
    “””
    Computes the similarity between list of queries and list of text. Returns a list
    of {id: value, score: value} sorted by highest score per query, where id is the
    index in texts.
    Args:
        queries: queries text
        texts: list of text
    Returns:
        list of {id: value, score: value} per query
    “””
    # Use similarity instance if available otherwise fall back to embeddings model
    if “similarity” in self.pipelines:
        return [[{“id”: uid, “score”: float(score)} for uid, score in r] for r in self.pipelines“similarity”]
    if self.embeddings:
        return [[{“id”: uid, “score”: float(score)} for uid, score in r] for r in self.embeddings.batchsimilarity(queries, texts)]
    return None

list of text

embeddings arrays

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def batchtransform(self, texts):
    “””
    Transforms list of text into embeddings arrays.
    Args:
        texts: list of text
    Returns:
        embeddings arrays
    “””
    if self.embeddings:
        documents = [(None, text, None) for text in texts]
        return [[float(x) for x in result] for result in self.embeddings.batchtransform(documents)]
    return None

number of elements in embeddings index

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def count(self):
    “””
    Total number of elements in this embeddings index.
    Returns:
        number of elements in embeddings index
    “””
    if self.cluster:
        return self.cluster.count()
    return super().count()

list of ids to delete

ids deleted

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def delete(self, ids):
    “””
    Deletes from an embeddings index. Returns list of ids deleted.
    Args:
        ids: list of ids to delete
    Returns:
        ids deleted
    “””
    if self.cluster:
        return self.cluster.delete(ids)
    return super().delete(ids)

query text

optional list of text, otherwise runs search query

optional limit if texts is None

list of dict per input text where a higher token scores represents higher importance relative to the query

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def explain(self, query, texts=None, limit=10):
    “””
    Explains the importance of each input token in text for a query.
    Args:
        query: query text
        texts: optional list of text, otherwise runs search query
        limit: optional limit if texts is None
    Returns:
        list of dict per input text where a higher token scores represents higher importance relative to the query
    “””
    if self.embeddings:
        with self.lock:
            return self.embeddings.explain(query, texts, limit)
    return None

list of {name: value, query: value, question: value, snippet: value}

optional list of text

list of {name: value, answer: value}

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def extract(self, queue, texts=None):
    “””
    Extracts answers to input questions.
    Args:
        queue: list of {name: value, query: value, question: value, snippet: value}
        texts: optional list of text
    Returns:
        list of {name: value, answer: value}
    “””
    if self.embeddings and “extractor” in self.pipelines:
        # Get extractor instance
        extractor = self.pipelines[“extractor”]
        # Run extractor and return results as dicts
        return extractor(queue, texts)
    return None

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def index(self):
    “””
    Builds an embeddings index for previously batched documents.
    “””
    if self.cluster:
        self.cluster.index()
    else:
        super().index()

text|list

list of labels

list of {id: value, score: value} per text element

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def label(self, text, labels):
    “””
    Applies a zero shot classifier to text using a list of labels. Returns a list of
    {id: value, score: value} sorted by highest score, where id is the index in labels.
    Args:
        text: text|list
        labels: list of labels
    Returns:
        list of {id: value, score: value} per text element
    “””
    if “labels” in self.pipelines:
        # Text is a string
        if isinstance(text, str):
            return [{“id”: uid, “score”: float(score)} for uid, score in self.pipelines“labels”]
        # Text is a list
        return [[{“id”: uid, “score”: float(score)} for uid, score in result] for result in self.pipelines“labels”]
    return None

pipeline name

pipeline arguments

pipeline results

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def pipeline(self, name, args):
    “””
    Generic pipeline execution method.
    Args:
        name: pipeline name
        args: pipeline arguments
    Returns:
        pipeline results
    “””
    if name in self.pipelines:
        return self.pipelinesname
    return None

new config

optional function to prepare content for indexing

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def reindex(self, config, function=None):
    “””
    Recreates this embeddings index using config. This method only works if document content storage is enabled.
    Args:
        config: new config
        function: optional function to prepare content for indexing
    “””
    if self.cluster:
        self.cluster.reindex(config, function)
    else:
        super().reindex(config, function)

query text

list of text

list of {id: value, score: value}

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def similarity(self, query, texts):
    “””
    Computes the similarity between query and list of text. Returns a list of
    {id: value, score: value} sorted by highest score, where id is the index
    in texts.
    Args:
        query: query text
        texts: list of text
    Returns:
        list of {id: value, score: value}
    “””
    # Use similarity instance if available otherwise fall back to embeddings model
    if “similarity” in self.pipelines:
        return [{“id”: uid, “score”: float(score)} for uid, score in self.pipelines“similarity”]
    if self.embeddings:
        return [{“id”: uid, “score”: float(score)} for uid, score in self.embeddings.similarity(query, texts)]
    return None

input text

embeddings array

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def transform(self, text):
    “””
    Transforms text into embeddings arrays.
    Args:
        text: input text
    Returns:
        embeddings array
    “””
    if self.embeddings:
        return [float(x) for x in self.embeddings.transform((None, text, None))]
    return None

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def upsert(self):
    “””
    Runs an embeddings upsert operation for previously batched documents.
    “””
    if self.cluster:
        self.cluster.upsert()
    else:
        super().upsert()

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def wait(self):
    “””
    Closes threadpool and waits for completion.
    “””
    if self.pool:
        self.pool.close()
        self.pool.join()
        self.pool = None

workflow name

elements to process

processed elements

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def workflow(self, name, elements):
    “””
    Executes a workflow.
    Args:
        name: workflow name
        elements: elements to process
    Returns:
        processed elements
    “””
    if hasattr(elements, “len“) and hasattr(elements, “getitem“):
        # Convert to tuples and return as a list since input is sized
        elements = [tuple(element) if isinstance(element, list) else element for element in elements]
    else:
        # Convert to tuples and return as a generator since input is not sized
        elements = (tuple(element) if isinstance(element, list) else element for element in elements)
    # Execute workflow
    return self.workflowsname