docstr: This function is used to get RAY_NODE category
docstr_tok: ["This","function","is","used","to","get","RAY_NODE","category"]
code: def get_category(self):
      """
      This function is used to get RAY_NODE category
      """
      for id in self.vsphere_sdk_client.tagging.Category.list():
          if (
              self.vsphere_sdk_client.tagging.Category.get(id).name
              == Constants.NODE_CATEGORY
          ):
              return id
      return None
  
imports: import logging
  import time
  import uuid
  from threading import RLock
  import com.vmware.vapi.std.errors_client
  import requests
  from com.vmware.cis.tagging_client import CategoryModel
  from com.vmware.content.library_client import Item
  from com.vmware.vapi.std.errors_client import Unauthenticated
  from com.vmware.vapi.std_client import DynamicID
  from com.vmware.vcenter.ovf_client import DiskProvisioningType, LibraryItem
  from com.vmware.vcenter.vm.hardware_client import Cpu, Memory
  from com.vmware.vcenter.vm_client import Power
  from com.vmware.vcenter_client import VM, Host, ResourcePool
  from vmware.vapi.vsphere.client import create_vsphere_client
  from ray.autoscaler._private.vsphere.utils import Constants, singleton_client
  from ray.autoscaler.tags import TAG_RAY_CLUSTER_NAME
label_desc: Use image node_id 15 for calling the VsphereSdkProvider obj's underlying member method code with example usage: obj.get_category() and returns: None, id