Divide iree_utils and do module imports on function calls.

.github/workflows/nightly.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest yapf toml
+        python -m pip install flake8 pytest toml
         if [ -f requirements.txt ]; then pip install -r requirements.txt --extra-index-url https://download.pytorch.org/whl/nightly/cpu  -f https://github.com/llvm/torch-mlir/releases -f https://github.com/nod-ai/SHARK-Runtime/releases; fi
     - name: Lint with flake8
       run: |
@@ -61,7 +61,6 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude shark.venv,lit.cfg.py 
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude shark.venv,lit.cfg.py 
-        yapf -i --style .style.yapf shark/*.py
 
     - name: Build and validate the package
       run: |

.github/workflows/python-format.yml

@@ -0,0 +1,15 @@
+name: black-formatter
+on: [pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.10.5
+      - name: Install Black
+        run: pip install black
+      - name: Run formatter check on the entire project.
+        run: black --line-length 80 --check .

.github/workflows/test-models.yml

@@ -37,7 +37,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest yapf toml
+        python -m pip install flake8 pytest toml
 
     - name: Lint with flake8
       run: |
@@ -45,7 +45,6 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics --exclude lit.cfg.py
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --exclude lit.cfg.py
-        yapf -i --style .style.yapf shark/*.py
 
     - name: Validate Models
       run: |