code: def __init__(
      self,
      inputCol=None,
      outputCol=None,
      chain=None,
      subscriptionKey=None,
      url=None,
      apiVersion=OPENAI_API_VERSION,
      errorCol="errorCol",
  ):
      super(LangchainTransformer, self).__init__()
      self.chain = Param(
          self,
          "chain",
          "Langchain chain",
      )
      self.subscriptionKey = Param(
          self, "subscriptionKey", "openai api key"
      )
      self.url = Param(self, "url", "openai api base")
      self.apiVersion = Param(self, "apiVersion", "openai api version")
      self.running_on_synapse_internal = running_on_synapse_internal()
      self.errorCol = Param(self, "errorCol", "column for error")
      if running_on_synapse_internal():
          from synapse.ml.fabric.service_discovery import (
              get_fabric_env_config,
          )
  
          self._setDefault(
              url=get_fabric_env_config().fabric_env_config.ml_workload_endpoint
              + "cognitive/openai"
          )
      kwargs = self._input_kwargs
      if subscriptionKey:
          kwargs["subscriptionKey"] = subscriptionKey
      if url:
          kwargs["url"] = url
      if apiVersion:
          kwargs["apiVersion"] = apiVersion
      if errorCol:
          kwargs["errorCol"] = errorCol
  
      self.setParams(**kwargs)
  
imports: import json
  from os import error
  from langchain.chains.loading import load_chain_from_config
  from pyspark import keyword_only
  from pyspark.ml import Transformer
  from pyspark.ml.param.shared import HasInputCol, HasOutputCol, Param
  from pyspark.ml.util import DefaultParamsReadable, DefaultParamsWritable, DefaultParamsReader, DefaultParamsWriter
  from pyspark.sql.functions import udf, col
  from pyspark.sql.types import StructType, StructField, StringType
  from typing import cast, Optional, TypeVar, Type
  from synapse.ml.core.platform import running_on_synapse_internal
label_desc: Use image node_id 1 to create a new LangchainTransformer object from inherited base classes: Transformer, HasInputCol, HasOutputCol, DefaultParamsReadable, DefaultParamsWritable with example: obj = LangchainTransformer(inputCol, outputCol, chain, subscriptionKey, url, apiVersion, errorCol)