Create MLX branch

Author: fchollet

keras/backend/__init__.py

@@ -40,6 +40,10 @@
 elif backend() == "numpy":
     from keras.backend.numpy import *  # noqa: F403
 
+    distribution_lib = None
+elif backend() == "mlx":
+    from keras.backend.mlx import *  # noqa: F403
+
     distribution_lib = None
 else:
     raise ValueError(f"Unable to import backend : {backend()}")