Add instructpix2pix model (#1451)
Summary:
I place this model in the `canary_model` directory for the following reasons:
1. The model only has inference test, no train test
2. The model installation is very slow, taking ~5 mins and is downloading large model checkpoints (~10GB)
3. The inference test is slow (~4 seconds) and has noisy outputs
It needs further work to make it suitable to the core model set.
Fixes https://github.com/pytorch/benchmark/issues/1444
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1451
Test Plan:
```
$ python run.py diffuser_instruct_pix2pix -d cuda
Fetching 15 files: 100%|███████████████| 15/15 [00:00<00:00, 27449.63it/s]
Running eval method from diffuser_instruct_pix2pix on cuda in eager mode with input batch size 1.
███████████████████████████████████████████| 100/100 [00:04<00:00, 23.96it/s]
GPU Time: 4123.949 milliseconds
CPU Total Wall Time: 4123.980 milliseconds
GPU 0 Peak Memory: 4.2791 GB
CPU Peak Memory: 3.7969 GB
```
Reviewed By: msaroufim
Differential Revision: D43842040
Pulled By: xuzhao9
fbshipit-source-id: adc21408b3562076c471c720863d3f135e58c7f8
