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xgboost_model_artifact.py
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xgboost_model_artifact.py
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# Copyright 2019 Atalaya Tech, Inc.
# Licensed 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.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
from bentoml.artifact import BentoServiceArtifact, BentoServiceArtifactWrapper
from bentoml.exceptions import MissingDependencyException, InvalidArgument
class XgboostModelArtifact(BentoServiceArtifact):
"""Abstraction for save/load object with Xgboost.
Args:
name (string): name of the artifact
model_extension (string): Extension name for saved xgboost model
Raises:
ImportError: xgboost package is required for using XgboostModelArtifact
TypeError: invalid argument type, model being packed must be instance of
xgboost.core.Booster
"""
def __init__(self, name, model_extension=".model"):
super(XgboostModelArtifact, self).__init__(name)
self._model_extension = model_extension
def _model_file_path(self, base_path):
return os.path.join(base_path, self.name + self._model_extension)
def pack(self, model): # pylint:disable=arguments-differ
return _XgboostModelArtifactWrapper(self, model)
def load(self, path):
try:
import xgboost as xgb
except ImportError:
raise MissingDependencyException(
"xgboost package is required to use XgboostModelArtifact"
)
bst = xgb.Booster()
bst.load_model(self._model_file_path(path))
return self.pack(bst)
class _XgboostModelArtifactWrapper(BentoServiceArtifactWrapper):
def __init__(self, spec, model):
super(_XgboostModelArtifactWrapper, self).__init__(spec)
try:
import xgboost as xgb
except ImportError:
raise MissingDependencyException(
"xgboost package is required to use XgboostModelArtifact"
)
if not isinstance(model, xgb.core.Booster):
raise InvalidArgument(
"Expect `model` argument to be a `xgboost.core.Booster` instance"
)
self._model = model
def save(self, dst):
return self._model.save_model(self.spec._model_file_path(dst))
def get(self):
return self._model