Remove yapf dependency (#23656)

Yapf has been replaced by black.

.gitpod/Dockerfile

@@ -15,7 +15,7 @@ RUN set -x; apt update \
     && mv bazel.gpg /etc/apt/trusted.gpg.d/ \
     && echo "deb [arch=amd64] https://storage.googleapis.com/bazel-apt stable jdk1.8" | tee /etc/apt/sources.list.d/bazel.list \
     && apt update && apt install bazel-3.7.2 -y \
-    && pip3 install cython==0.29.26 pytest pandas tree tabulate pexpect sklearn joblib black==21.12b0 yapf==0.23.0 flake8==3.9.1 mypy==0.782 flake8-quotes flake8-bugbear==21.9.2 setproctitle==1.1.10 psutil \
+    && pip3 install cython==0.29.26 pytest pandas tree tabulate pexpect sklearn joblib black==21.12b0 flake8==3.9.1 mypy==0.782 flake8-quotes flake8-bugbear==21.9.2 setproctitle==1.1.10 psutil \
     && python3 -c  'print("startup --output_base=/workspace/ray/.bazel-cache\nstartup --host_jvm_args=-Xmx1800m\nbuild --jobs=6")' > /etc/bazel.bazelrc
 
 RUN update-alternatives --install /usr/local/bin/python python /usr/bin/python3 30 \

python/ray/tune/requirements-dev.txt

@@ -7,4 +7,3 @@ requests
 tabulate
 tensorflow
 black==21.12b0
-yapf==0.23.0

python/requirements_linters.txt

@@ -4,4 +4,3 @@ flake8-quotes==2.0.0
 flake8-bugbear==21.9.2
 mypy==0.782
 black==21.12b0
-yapf==0.23.0

rllib/agents/alpha_star/alpha_star.py

@@ -40,7 +40,7 @@ from ray.rllib.utils.typing import (
 from ray.tune.utils.placement_groups import PlacementGroupFactory
 from ray.util.timer import _Timer
 
-# yapf: disable
+# fmt: off
 # __sphinx_doc_begin__
 
 # Adds the following updates to the `IMPALATrainer` config in
@@ -122,7 +122,7 @@ DEFAULT_CONFIG = Trainer.merge_trainer_configs(
 )
 
 # __sphinx_doc_end__
-# yapf: enable
+# fmt: on
 
 
 class AlphaStarTrainer(appo.APPOTrainer):