add some alias

Author: refraction-ray

requirements/requirements-rtd.txt

@@ -3,6 +3,7 @@ scipy
 cirq
 tensorflow
 tensornetwork
+stim
 graphviz
 networkx
 jax

tensorcircuit/__init__.py

@@ -31,11 +31,13 @@
 from .densitymatrix import DMCircuit2
 
 DMCircuit = DMCircuit2  # compatibility issue to still expose DMCircuit2
+DensityMatrixCircuit = DMCircuit
 
 try:
     from .stabilizercircuit import StabilizerCircuit
 
     CliffordCircuit = StabilizerCircuit
+    StabCircuit = StabilizerCircuit
 except ModuleNotFoundError:
     pass
 
@@ -51,6 +53,8 @@
 from . import fgs
 from .fgs import FGSSimulator
 
+FGSCircuit = FGSSimulator
+
 try:
     from . import keras
     from .keras import KerasLayer, KerasHardwareLayer