Add passthrough rescaler + Git CI style checker

.circleci/ci-requirements.txt

@@ -0,0 +1 @@
+yapf

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2.1
+orbs:
+  python: circleci/[email protected]
+
+jobs:
+  linting:
+    executor: python/default
+    steps:
+      - checkout
+      - python/install-packages:
+          pip-dependency-file: .circleci/ci-requirements.txt
+          pkg-manager: pip
+      - run:
+          name: Run tests
+          command: yapf -d --recursive rlmeta
+
+workflows:
+  main:
+    jobs:
+      - linting

rlmeta/core/rescalers.py

@@ -31,6 +31,15 @@ def recover(self, x: torch.Tensor) -> torch.Tensor:
         """
 
 
+class PassthroughRescaler(Rescaler):
+
+    def rescale(self, x: torch.Tensor) -> torch.Tensor:
+        return x
+
+    def recover(self, x: torch.Tensor) -> torch.Tensor:
+        return x
+
+
 class RMSRescaler(Rescaler):
 
     def __init__(self, size: Union[int, Tuple[int]]) -> None: