code: def rate(self):
      return rate_instance_hour_to_fraction_msec(
          self.cost_per_hour, 1024
      )
  
imports: import asyncio
  import logging
  from typing import Dict, List, Optional
  from hailtop.aiocloud import aioazure
  from hailtop.utils import flatten, grouped
  from hailtop.utils.rates import rate_gib_month_to_mib_msec, rate_instance_hour_to_fraction_msec
  from hailtop.utils.time import parse_timestamp_msecs
  from ....driver.pricing import Price
  from ..resource_utils import azure_disk_name_to_storage_gib, azure_valid_machine_types
  from ..resources import AzureStaticSizedDiskResource, AzureVMResource
label_desc: Use image node_id 3 for calling the AzureVMPrice obj's underlying member method code with example usage: obj.rate() and returns: rate_instance_hour_to_fraction_msec