Unexpected warning when calculating expectation with readout error
## Issue Description

Unexpected warning when calculating expectation with readout error.
The problem is at
https://github.com/tencent-quantum-lab/tensorcircuit/blob/b413089bd514c90b7998b9d2ca9125d5debd9849/tensorcircuit/noisemodel.py#L282

When counting gates, ``standardize_gate`` is called.

## How to Reproduce

```python
c = DMCircuit(2)

nc = NoiseConf()
re = 0.95
nc.add_noise("readout", [[re, re],[re, re]])
c.sample_expectation_ps([0], shots=1024, noise_conf=nc)
```

### Error Output

```python
WARNING:tensorcircuit.abstractcircuit:gate name not in the common gate set that tc supported
```

## Environment Context

commit df6679561e71cbc3eec1d3f5f2c731b008591a8f

diff --git a/tensorcircuit/abstractcircuit.py b/tensorcircuit/abstractcircuit.py
index ce08da1..f17680a 100644
--- a/tensorcircuit/abstractcircuit.py
+++ b/tensorcircuit/abstractcircuit.py
@@ -453,7 +453,9 @@ class AbstractCircuit:
                 name = g1
                 break
         if name not in sgates + vgates + mpogates:
-            logger.warning("gate name not in the common gate set that tc supported")
+            logger.warning(
+                "gate name %s not in the common gate set that tc supported" % name
+            )
         return name
 
     def gate_count(self, gate_list: Optional[Sequence[str]] = None) -> int:
diff --git a/tensorcircuit/noisemodel.py b/tensorcircuit/noisemodel.py
index 6f50beb..a222a23 100644
--- a/tensorcircuit/noisemodel.py
+++ b/tensorcircuit/noisemodel.py
@@ -279,7 +279,10 @@ def sample_expectation_ps_noisfy(
     if noise_conf is None:
         noise_conf = NoiseConf()
 
-    num_quantum = c.gate_count(list(noise_conf.nc.keys()))
+    lgate = list(noise_conf.nc.keys())
+    if "readout" in lgate:
+        lgate.remove("readout")
+    num_quantum = c.gate_count(lgate)
 
     if noise_conf.has_readout is True:
         readout_error = noise_conf.nc["readout"]["Default"]
['tensorcircuit/noisemodel.py', 'tensorcircuit/abstractcircuit.py']