use nightly torchvision and torch 1.3 (#62)

Summary:
Pull Request resolved: #62

Current dependency torchvision 0.4.0 was released in August.
It missed quite a few PRs that are merged after that, and that are needed for video classification, such as

- pytorch/vision#1437
- pytorch/vision#1431
- pytorch/vision#1423
- pytorch/vision#1418
- pytorch/vision#1408
- pytorch/vision#1376
- pytorch/vision#1363
- pytorch/vision#1353
- pytorch/vision#1303

This will fail the CI test when a diff uses changes made in those PRs.
Before a new official version of TorchVision is released, we can temporarily use the nightly torchvision to get all the recent PRs, and unblock the PR merging.
We plan to use a fixed version of TorchVision later.

Reviewed By: vreis

Differential Revision: D17944239

fbshipit-source-id: 86ff540e3fc4f08ef767e84ef103525db5158201

Author: stephenyan1231

.circleci/config.yml

@@ -26,6 +26,7 @@ jobs:
             python3 -m venv venv
             . venv/bin/activate
             pip install -r requirements.txt
+            pip install --pre torch torchvision -f https://download.pytorch.org/whl/nightly/cu101/torch_nightly.html
 
       - save_cache:
           paths:

requirements.txt

@@ -1,2 +1 @@
-torch==1.2
-torchvision==0.4.0
+torch==1.3