Add fastai upstream and downstream capacities for fastai>=2.4 and fastcore>=1.3.27 versions

.github/workflows/python-tests.yml

@@ -90,6 +90,27 @@ jobs:
         pip install .[testing,tensorflow]
 
     - run: pytest -Werror::FutureWarning -sv ./tests/test_keras*
+
+  build_fastai:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.7", "3.9"]
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        pip install --upgrade pip
+        pip install .[testing,fastai]
+
+    - run: pytest -Werror::FutureWarning -sv ./tests/test_fastai*
 
   tests_lfs:
     runs-on: ubuntu-latest

setup.py

@@ -27,6 +27,12 @@ def get_version() -> str:
     "torch",
 ]
 
+extras["fastai"] = [
+    "toml",
+    "fastai==2.5.3",
+    "fastcore==1.3.29",
+]
+
 extras["tensorflow"] = ["tensorflow", "pydot", "graphviz"]
 
 extras["testing"] = [

src/huggingface_hub/__init__.py

@@ -30,6 +30,11 @@
     TF2_WEIGHTS_NAME,
     TF_WEIGHTS_NAME,
 )
+from .fastai_utils import (
+    from_pretrained_fastai,
+    push_to_hub_fastai,
+    save_fastai_learner,
+)
 from .file_download import cached_download, hf_hub_download, hf_hub_url
 from .hf_api import (
     DatasetSearchArguments,