Add config for flake, black, and isort

and pre-commit config

.flake8

@@ -0,0 +1,5 @@
+[flake8]
+max-line-length = 127
+max-complexity = 18
+select = B, C, E, F, W, T4, B9
+ignore = E203, E266, E501, W503, F403, F401, W605, E722, C901

.isort.cfg

@@ -0,0 +1,7 @@
+[settings]
+line_length=127
+multi_line_output=3
+include_trailing_comma=True
+;force_grid_wrap=0
+known_first_party = tests
+known_third_party = bootleg,datasets,dill,elasticsearch,kfserving,marisa_trie,nltk,numpy,pathos,pyrouge,requests,sacrebleu,sentence_transformers,seqeval,setuptools,sklearn,tensorboardX,torch,tqdm,transformers,ujson,xgboost

.pre-commit-config.yaml

@@ -0,0 +1,21 @@
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      - id: check-yaml
+      - id: end-of-file-fixer
+      - id: trailing-whitespace
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.8.0
+    hooks:
+      - id: isort
+-   repo: https://github.com/psf/black
+    rev: 21.5b1
+    hooks:
+      - id: black
+        language_version: python3.8
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.3.0
+    hooks:
+      - id: flake8
+        verbose: true

pyproject.toml

@@ -0,0 +1,15 @@
+[tool.black]
+line-length = 127
+target-version = ['py38']
+skip-string-normalization = true
+exclude = '''
+/(
+    \.git
+  | \.mypy_cache
+  | \.venv
+  | _build
+  | buck-out
+  | build
+  | dist
+)/
+'''