…ed-bert

Differential Revision: D18753252

fbshipit-source-id: 18bfe1d38d1afca4eb48a2e2e33ddc1b137aa047

Summary:
Pull Request resolved: facebookresearch#1175

Currently, we installs fairseq by requirements.txt which is equivalent to  ```pip install fairseq```

According to https://github.com/pytorch/fairseq, to install fairseq in MacOS, we need to run
```CFLAGS="-stdlib=libc++" pip install fairseq```

Before this diff:
Can't install PyText in MacOS by
$ ./install_deps

  Installing collected packages: click, pycparser, cffi, fastBPE, numpy, regex, portalocker, typing, sacrebleu, torch, tqdm, fairseq, attrs,   hypothesis, joblib, typing-extensions, six, setuptools, protobuf, onnx, python-dateutil, certifi, urllib3, idna, chardet, requests, jmespath,   docutils, botocore, s3transfer, boto3, pytorch-pretrained-bert, pytz, pandas, scipy, torchtext, wheel, grpcio, werkzeug, markdown, absl-py,   tensorboard, sentencepiece, pytext-nlp
      Running setup.py install for pycparser ... done
      Running setup.py install for fastBPE ... error
      ERROR: Command errored out with exit status 1:
       command: /Users/stevenliu/workspace/sphinx/pytext/pytext_venv/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] =   '"'"'/private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-install-x0x9inoi/fastBPE/setup.py'"'"'; __file__='"'"'/private/var/folders/  sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-install-x0x9inoi/fastBPE/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"',   open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install   --record /private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-record-1kds02_a/install-record.txt --single-version-externally-managed   --compile --install-headers /Users/stevenliu/workspace/sphinx/pytext/pytext_venv/include/site/python3.7/fastBPE
           cwd: /private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-install-x0x9inoi/fastBPE/
      Complete output (16 lines):
      running install
      running build
      running build_py
      package init file 'fastBPE/__init__.py' not found (or not a regular file)
      running build_ext
      building 'fastBPE' extension
      creating build
      creating build/temp.macosx-10.7-x86_64-3.7
      creating build/temp.macosx-10.7-x86_64-3.7/fastBPE
      gcc -Wno-unused-result -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/Users/stevenliu/  anaconda3/include -arch x86_64 -I/Users/stevenliu/anaconda3/include -arch x86_64 -I/Users/stevenliu/workspace/sphinx/pytext/pytext_venv/  include -I/Users/stevenliu/anaconda3/include/python3.7m -c fastBPE/fastBPE.cpp -o build/temp.macosx-10.7-x86_64-3.7/fastBPE/fastBPE.o   -std=c++11 -Ofast -pthread
      warning: include path for stdlibc++ headers not found; pass '-stdlib=libc++' on the command line to use the libc++ standard library instead   [-Wstdlibcxx-not-found]
      fastBPE/fastBPE.cpp:603:10: fatal error: 'ios' file not found
      #include "ios"
               ^~~~~
      1 warning and 1 error generated.
      error: command 'gcc' failed with exit status 1
      ----------------------------------------
  ERROR: Command errored out with exit status 1: /Users/stevenliu/workspace/sphinx/pytext/pytext_venv/bin/python3 -u -c 'import sys, setuptools,   tokenize; sys.argv[0] = '"'"'/private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-install-x0x9inoi/fastBPE/setup.py'"'"';   __file__='"'"'/private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-install-x0x9inoi/fastBPE/setup.py'"'"';f=getattr(tokenize,   '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /private/var/folders/sg/jcdjt2vn6pndx_d0vmf0l2n15y5jp7/T/pip-record-1kds02_a/install-record.txt --single-version-externally-managed --compile --install-headers /Users/stevenliu/workspace/sphinx/pytext/pytext_venv/include/site/python3.7/fastBPE Check the logs for full command output.

BTW, made activation_venv executable as install_deps

Differential Revision: D18753339

fbshipit-source-id: 9507101610de0f01fef5c766a315cf3269068565