def __enter__()

in src/kernels/layer.py [0:0]


        def __enter__(self):
            # Mappings always stack on previous mappings.
            if inherit_mapping:
                self.token = _KERNEL_MAPPING.set(deepcopy(_KERNEL_MAPPING.get()))
            else:
                self.token = _KERNEL_MAPPING.set({})
            register_kernel_mapping(mapping)