Make returnn.frontend a proper Python package #1277
Merged
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This is some refactoring of the new frontend API (#1120).
returnn.frontend
is now a Python package.Frontend
class has been renamed toBackend
, and related code accordingly.Backend
class is supposed to be internal code. We provide other methods for the user to switch the backends.InternalFrontend
has been merged intoBackend
as well. This separation is not needed anymore.This also simplifies moving the RETURNN-common
nn
code (rwth-i6/returnn_common#252).