Added kernel SME filter

Author: FlorianPfaff

pyrecest/_backend/__init__.py

@@ -234,6 +234,7 @@ def get_backend_name():
         "sqrtm",
         "svd",
         "matrix_rank",
+        "block_diag",  # For pyrecest
     ],
     "random": [
         "choice",

pyrecest/_backend/jax/linalg.py

@@ -15,6 +15,7 @@
     qr,
 )
 from jax.scipy.linalg import (
+    block_diag,
     expm,
     sqrtm,
     polar,

pyrecest/_backend/numpy/linalg.py

@@ -14,7 +14,7 @@
     norm,
     svd,
 )
-from scipy.linalg import expm
+from scipy.linalg import expm, block_diag
 
 from .._shared_numpy.linalg import (
     fractional_matrix_power,