# File lib/fog/aws/requests/emr/modify_instance_groups.rb, line 18
        def modify_instance_groups(options={})
          
          if job_ids = options.delete('InstanceGroups')
            options.merge!(Fog::AWS.serialize_keys('InstanceGroups', job_ids))
          end
    
          request({
            'Action'  => 'ModifyInstanceGroups',
            :parser   => Fog::Parsers::AWS::EMR::ModifyInstanceGroups.new,
          }.merge(options))
        end