Update base multitarget

Author: andreped

torchstain/base/normalizers/multitarget.py

@@ -1,6 +1,10 @@
-def MultiMacenkoNormalizer(backend='torch', **kwargs):
-    if backend == 'torch':
-        from torchstain.torch.normalizers.multitarget import MultiMacenkoNormalizer
-        return MultiMacenkoNormalizer(**kwargs)
+def MultiMacenkoNormalizer(backend="torch", **kwargs):
+    if backend == "numpy":
+        raise NotImplementedError("MultiMacenkoNormalizer is not implemented for NumPy backend")
+    elif backend == "torch":
+        from torchstain.torch.normalizers import TorchMultiMacenkoNormalizer
+        return TorchMultiMacenkoNormalizer(**kwargs)
+    elif backend == "tensorflow":
+        raise NotImplementedError("MultiMacenkoNormalizer is not implemented for TensorFlow backend")
     else:
-        raise Exception(f'Unsupported backend {backend}')
+        raise Exception(f"Unsupported backend {backend}")