default opt-out from new models

Author: esoteric-ephemera

.github/workflows/testing.yml

@@ -103,6 +103,7 @@ jobs:
       - name: Test with pytest
         if: always() # run tests even if linting failed
         shell: bash -l {0}
+        env: EMMET_USE_EMMET_MODELS=true
         run: python${{ matrix.python-version }} -m pytest -n auto --cov=emmet --cov-report=xml ${{ matrix.package }}/tests
 
       - uses: codecov/[email protected]

emmet-core/emmet/core/settings.py

@@ -174,9 +174,9 @@ class EmmetSettings(BaseSettings):
     )
 
     USE_EMMET_MODELS: bool = Field(
-        True,
+        False,
         description=(
-            "Whether to use emmet (True) or pymatgen (False) models "
+            "Whether to use emmet (True) or pymatgen (False, default) models "
             "for materials simulation outputs in certain document models "
             "which are used only in workflows and not in build pipelines."
         ),