Make large host for pytorch. (#3223)

Summary:
2xlarge+ is not currently available.

Some comments from #3164

Documentation:
n/a

cc: zrphercule
Pull Request resolved: #3223

Differential Revision: D16207528

Pulled By: rdzhabarov

fbshipit-source-id: 366886ba863d5fba09f9cbd86dcb976d0d3caccd

.circleci/config.yml

@@ -98,7 +98,6 @@ jobs:
       DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/caffe2/py2-clang8-ubuntu16.04:283"
     <<: *linux_default
   PYTORCH:
-    resource_class: 2xlarge+
     environment:
       DOCKER_IMAGE: "308535385114.dkr.ecr.us-east-1.amazonaws.com/caffe2/py3.6-clang7-ubuntu16.04:287"
     <<: *linux_default