#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import logging
import time
from typing import Any
from typing import Dict
from typing import Iterable
from typing import Mapping
from typing import Optional
from typing import Sequence
from google.api_core.exceptions import ServerError
from google.api_core.exceptions import TooManyRequests
from google.cloud import aiplatform
from apache_beam.io.components.adaptive_throttler import AdaptiveThrottler
from apache_beam.metrics.metric import Metrics
from apache_beam.ml.inference import utils
from apache_beam.ml.inference.base import ModelHandler
from apache_beam.ml.inference.base import PredictionResult
from apache_beam.utils import retry
MSEC_TO_SEC = 1000
LOGGER = logging.getLogger("VertexAIModelHandlerJSON")
# pylint: disable=line-too-long
def _retry_on_appropriate_gcp_error(exception):
"""
Retry filter that returns True if a returned HTTP error code is 5xx or 429.
This is used to retry remote requests that fail, most notably 429
(TooManyRequests.)
Args:
exception: the returned exception encountered during the request/response
loop.
Returns:
boolean indication whether or not the exception is a Server Error (5xx) or
a TooManyRequests (429) error.
"""
return isinstance(exception, (TooManyRequests, ServerError))
[docs]class VertexAIModelHandlerJSON(ModelHandler[Any,
PredictionResult,
aiplatform.Endpoint]):
def __init__(
self,
endpoint_id: str,
project: str,
location: str,
experiment: Optional[str] = None,
network: Optional[str] = None,
private: bool = False,
*,
min_batch_size: Optional[int] = None,
max_batch_size: Optional[int] = None,
max_batch_duration_secs: Optional[int] = None,
**kwargs):
"""Implementation of the ModelHandler interface for Vertex AI.
**NOTE:** This API and its implementation are under development and
do not provide backward compatibility guarantees.
Unlike other ModelHandler implementations, this does not load the model
being used onto the worker and instead makes remote queries to a
Vertex AI endpoint. In that way it functions more like a mid-pipeline
IO. Public Vertex AI endpoints have a maximum request size of 1.5 MB.
If you wish to make larger requests and use a private endpoint, provide
the Compute Engine network you wish to use and set `private=True`
Args:
endpoint_id: the numerical ID of the Vertex AI endpoint to query
project: the GCP project name where the endpoint is deployed
location: the GCP location where the endpoint is deployed
experiment: optional. experiment label to apply to the
queries. See
https://cloud.google.com/vertex-ai/docs/experiments/intro-vertex-ai-experiments
for more information.
network: optional. the full name of the Compute Engine
network the endpoint is deployed on; used for private
endpoints. The network or subnetwork Dataflow pipeline
option must be set and match this network for pipeline
execution.
Ex: "projects/12345/global/networks/myVPC"
private: optional. if the deployed Vertex AI endpoint is
private, set to true. Requires a network to be provided
as well.
min_batch_size: optional. the minimum batch size to use when batching
inputs.
max_batch_size: optional. the maximum batch size to use when batching
inputs.
max_batch_duration_secs: optional. the maximum amount of time to buffer
a batch before emitting; used in streaming contexts.
"""
self._batching_kwargs = {}
self._env_vars = kwargs.get('env_vars', {})
if min_batch_size is not None:
self._batching_kwargs["min_batch_size"] = min_batch_size
if max_batch_size is not None:
self._batching_kwargs["max_batch_size"] = max_batch_size
if max_batch_duration_secs is not None:
self._batching_kwargs["max_batch_duration_secs"] = max_batch_duration_secs
if private and network is None:
raise ValueError(
"A VPC network must be provided to use a private endpoint.")
# TODO: support the full list of options for aiplatform.init()
# See https://cloud.google.com/python/docs/reference/aiplatform/latest/google.cloud.aiplatform#google_cloud_aiplatform_init
aiplatform.init(
project=project,
location=location,
experiment=experiment,
network=network)
# Check for liveness here but don't try to actually store the endpoint
# in the class yet
self.endpoint_name = endpoint_id
self.is_private = private
_ = self._retrieve_endpoint(self.endpoint_name, self.is_private)
# Configure AdaptiveThrottler and throttling metrics for client-side
# throttling behavior.
# See https://docs.google.com/document/d/1ePorJGZnLbNCmLD9mR7iFYOdPsyDA1rDnTpYnbdrzSU/edit?usp=sharing
# for more details.
self.throttled_secs = Metrics.counter(
VertexAIModelHandlerJSON, "cumulativeThrottlingSeconds")
self.throttler = AdaptiveThrottler(
window_ms=1, bucket_ms=1, overload_ratio=2)
def _retrieve_endpoint(
self, endpoint_id: str, is_private: bool) -> aiplatform.Endpoint:
"""Retrieves an AI Platform endpoint and queries it for liveness/deployed
models.
Args:
endpoint_id: the numerical ID of the Vertex AI endpoint to retrieve.
is_private: a boolean indicating if the Vertex AI endpoint is a private
endpoint
Returns:
An aiplatform.Endpoint object
Raises:
ValueError: if endpoint is inactive or has no models deployed to it.
"""
if is_private:
endpoint: aiplatform.Endpoint = aiplatform.PrivateEndpoint(
endpoint_name=endpoint_id)
LOGGER.debug("Treating endpoint %s as private", endpoint_id)
else:
endpoint = aiplatform.Endpoint(endpoint_name=endpoint_id)
LOGGER.debug("Treating endpoint %s as public", endpoint_id)
try:
mod_list = endpoint.list_models()
except Exception as e:
raise ValueError(
"Failed to contact endpoint %s, got exception: %s", endpoint_id, e)
if len(mod_list) == 0:
raise ValueError("Endpoint %s has no models deployed to it.", endpoint_id)
return endpoint
[docs] def load_model(self) -> aiplatform.Endpoint:
"""Loads the Endpoint object used to build and send prediction request to
Vertex AI.
"""
# Check to make sure the endpoint is still active since pipeline
# construction time
ep = self._retrieve_endpoint(self.endpoint_name, self.is_private)
return ep
[docs] @retry.with_exponential_backoff(
num_retries=5, retry_filter=_retry_on_appropriate_gcp_error)
def get_request(
self,
batch: Sequence[Any],
model: aiplatform.Endpoint,
throttle_delay_secs: int,
inference_args: Optional[Dict[str, Any]]):
while self.throttler.throttle_request(time.time() * MSEC_TO_SEC):
LOGGER.info(
"Delaying request for %d seconds due to previous failures",
throttle_delay_secs)
time.sleep(throttle_delay_secs)
self.throttled_secs.inc(throttle_delay_secs)
try:
req_time = time.time()
prediction = model.predict(
instances=list(batch), parameters=inference_args)
self.throttler.successful_request(req_time * MSEC_TO_SEC)
return prediction
except TooManyRequests as e:
LOGGER.warning("request was limited by the service with code %i", e.code)
raise
except Exception as e:
LOGGER.error("unexpected exception raised as part of request, got %s", e)
raise
[docs] def run_inference(
self,
batch: Sequence[Any],
model: aiplatform.Endpoint,
inference_args: Optional[Dict[str, Any]] = None
) -> Iterable[PredictionResult]:
""" Sends a prediction request to a Vertex AI endpoint containing batch
of inputs and matches that input with the prediction response from
the endpoint as an iterable of PredictionResults.
Args:
batch: a sequence of any values to be passed to the Vertex AI endpoint.
Should be encoded as the model expects.
model: an aiplatform.Endpoint object configured to access the desired
model.
inference_args: any additional arguments to send as part of the
prediction request.
Returns:
An iterable of Predictions.
"""
# Endpoint.predict returns a Prediction type with the prediction values
# along with model metadata
prediction = self.get_request(
batch, model, throttle_delay_secs=5, inference_args=inference_args)
return utils._convert_to_result(
batch, prediction.predictions, prediction.deployed_model_id)
[docs] def validate_inference_args(self, inference_args: Optional[Dict[str, Any]]):
pass
[docs] def batch_elements_kwargs(self) -> Mapping[str, Any]:
return self._batching_kwargs