jeff3071 opened a new pull request, #72501:
URL: https://github.com/apache/airflow/pull/72501
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Why
---
Cohere provider only supports embedding and does not provide an operator for
the Rerank API.
What
---
- Add `CohereHook.rerank` to rank documents by relevance to a query.
- Add `CohereRerankOperator` with `top_n` and `max_tokens_per_doc` support.
- Return an XCom-serializable dictionary containing ranked indexes and
relevance scores.
- Add unit tests, documentation, and an example Dag.
Test
---
Use the testing Dag below with a Cohere connection (Azure).
```python
from __future__ import annotations
import logging
from datetime import datetime, timezone
from typing import Any
from airflow.providers.cohere.operators.rerank import CohereRerankOperator
from airflow.sdk import dag, task
log = logging.getLogger(__name__)
@dag(
dag_id="test_azure_cohere_rerank",
schedule=None,
start_date=datetime(2025, 1, 1, tzinfo=timezone.utc),
catchup=False,
tags=["cohere", "azure", "rerank", "test"],
)
def test_azure_cohere_rerank():
reranked = CohereRerankOperator(
task_id="rerank_documents",
conn_id="cohere_azure",
query="What is the capital of the United States?",
documents=[
"Carson City is the capital city of Nevada.",
"Washington, D.C. is the capital of the United States.",
"The capital city of France is Paris.",
],
top_n=2,
)
@task
def verify_results(response: dict[str, Any]) -> None:
results = response.get("results")
if not results:
raise ValueError("Cohere returned no reranking results")
first_result = results[0]
if "index" not in first_result or "relevance_score" not in
first_result:
raise ValueError("Cohere reranking result is missing its index
or relevance score")
log.info("Highest-ranked document: %s", first_result)
verify_results(reranked.output)
test_azure_cohere_rerank()
```
log
```
::group::Log message source details
/root/airflow/logs/dag_id=test_azure_cohere_rerank/run_id=manual__2026-09-04T06:59:03.159000+00:00/task_id=rerank_documents/attempt=1.log
::endgroup::
[2026-09-04T06:59:04.172411Z] INFO - ::group::Pre Execute
Task Identity ti_id=01a06b36-b784-737c-a285-3fa0673a58dc
dag_id=test_azure_cohere_rerank task_id=rerank_documents
run_id=manual__2026-09-04T06:59:03.159000+00:00 try_number=1 map_index=-1
[2026-09-04T06:59:04.208824Z] INFO - DAG bundles loaded: dags-folder
[2026-09-04T06:59:04.209832Z] INFO - Filling up the DagBag from
/files/dags/test_azure_cohere_rerank.py
[2026-09-04T06:59:04.284956Z] INFO - Worker startup parse complete
bundle_name=dags-folder bundle_version=null
dag_file=test_azure_cohere_rerank.py bundle_prepare_ms=2 dag_file_parse_ms=75
[2026-09-04T06:59:04.312538Z] INFO - ::endgroup::
[2026-09-04T06:59:08.422692Z] INFO - ::group::Post Execute
[2026-09-04T06:59:08.423119Z] INFO - Pushing xcom
ti=RuntimeTaskInstance(id=UUID('01a06b36-b784-737c-a285-3fa0673a58dc'),
task_id='rerank_documents', dag_id='test_azure_cohere_rerank',
run_id='manual__2026-09-04T06:59:03.159000+00:00', try_number=1,
dag_version_id=UUID('01a06b31-96de-780b-9344-11512671e374'), map_index=-1,
hostname='bed06d3cd41b', context_carrier={'traceparent':
'00-398c0a86f4882365defcedb4de9cea71-e1df67c087d2aa62-00'}, queue='default',
task=<Task(CohereRerankOperator): rerank_documents>,
bundle_instance=LocalDagBundle(name=dags-folder), max_tries=0,
start_date=datetime.datetime(2026, 9, 4, 6, 59, 4, 178740,
tzinfo=datetime.timezone.utc), end_date=None, state=<TaskInstanceState.RUNNING:
'running'>, is_mapped=False, rendered_map_index=None, sentry_integration='')
[2026-09-04T06:59:08.479633Z] INFO - ::endgroup::
::group::Log message source details
/root/airflow/logs/dag_id=test_azure_cohere_rerank/run_id=manual__2026-09-04T06:59:03.159000+00:00/task_id=verify_results/attempt=1.log
::endgroup::
[2026-09-04T06:59:09.077249Z] INFO - ::group::Pre Execute
Task Identity ti_id=01a06b36-b785-7dde-b2c0-3e3fa1256d3c
dag_id=test_azure_cohere_rerank task_id=verify_results
run_id=manual__2026-09-04T06:59:03.159000+00:00 try_number=1 map_index=-1
[2026-09-04T06:59:09.088840Z] INFO - DAG bundles loaded: dags-folder
[2026-09-04T06:59:09.089513Z] INFO - Filling up the DagBag from
/files/dags/test_azure_cohere_rerank.py
[2026-09-04T06:59:09.165990Z] INFO - Worker startup parse complete
bundle_name=dags-folder bundle_version=null
dag_file=test_azure_cohere_rerank.py bundle_prepare_ms=1 dag_file_parse_ms=76
[2026-09-04T06:59:09.190519Z] INFO - ::endgroup::
[2026-09-04T06:59:09.191773Z] INFO - Highest-ranked document: {'index': 1,
'relevance_score': 0.9446076}
[2026-09-04T06:59:09.191919Z] INFO - Done. Returned value was: None
[2026-09-04T06:59:09.192023Z] INFO - ::group::Post Execute
[2026-09-04T06:59:09.200257Z] INFO - ::endgroup::
```
---
---
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