Divide iree_utils and do module imports on function calls.

.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: |