# Copyright (C) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See LICENSE in project root for information.
from synapse.ml.lightgbm._LightGBMRankerModel import _LightGBMRankerModel
from synapse.ml.lightgbm.mixin import LightGBMModelMixin
from pyspark import SparkContext
from pyspark.ml.common import inherit_doc
from pyspark.ml.wrapper import JavaParams
from synapse.ml.core.serialize.java_params_patch import *
[docs]@inherit_doc
class LightGBMRankerModel(LightGBMModelMixin, _LightGBMRankerModel):
[docs] @staticmethod
def loadNativeModelFromFile(filename):
"""
Load the model from a native LightGBM text file.
"""
ctx = SparkContext._active_spark_context
loader = ctx._jvm.com.microsoft.azure.synapse.ml.lightgbm.LightGBMRankerModel
java_model = loader.loadNativeModelFromFile(filename)
return JavaParams._from_java(java_model)
[docs] @staticmethod
def loadNativeModelFromString(model):
"""
Load the model from a native LightGBM model string.
"""
ctx = SparkContext._active_spark_context
loader = ctx._jvm.com.microsoft.azure.synapse.ml.lightgbm.LightGBMRankerModel
java_model = loader.loadNativeModelFromString(model)
return JavaParams._from_java(java_model)
[docs] def getBoosterNumClasses(self):
"""Get the number of classes from the booster.
Returns:
The number of classes.
"""
return self._java_obj.getBoosterNumClasses()