code: def _select_instance_type(self, resources_needed):
      sorted_specs = sorted(
          _instance_specs.items(), key=lambda x: self.prices[x[0]]
      )
      for instance in sorted_specs:
          if (
              int(instance[1]["cpus"]) >= int(resources_needed["cpus"])
              and memstr2int(instance[1]["ram"])
              >= memstr2int(resources_needed["ram"])
              and int(instance[1]["gpus"])
              >= int(resources_needed["gpus"])
          ):
              return instance[0]
  
      raise ValueError(
          "No instances that satisfy requirements {} "
          "can be found".format(resources_needed)
      )
  
imports: import uuid
  import os
  import base64
  import json
  import yaml
  import six
  import filelock
  import hashlib
  import pickle
  from studio import git_util
  from studio.util import logs
  from studio.storage import storage_util
  from studio.util.gpu_util import memstr2int
  from .cloud_worker_util import insert_user_startup_script
label_desc: Use image node_id 5 for calling the EC2WorkerManager obj's underlying member method code with example usage: obj._select_instance_type(resources_needed) and returns: instance