我在nvidia-dgx2机器上尝试了以下代码。

import cirq

# Pick a qubit.
qubit = cirq.GridQubit(0, 0)

# Create a circuit
circuit = cirq.Circuit(
    cirq.X(qubit)**0.5,  # Square root of NOT.
    cirq.measure(qubit, key='m')  # Measurement.
)
print("Circuit:")
print(circuit)

# Simulate the circuit several times.
simulator = cirq.Simulator()
result = simulator.run(circuit, repetitions=20)
print("Results:")
print(result)

但是，我得到了属性错误。

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
/tmp/ipykernel_36197/3759634386.py in <module>
      2 
      3 # Pick a qubit.
----> 4 qubit = cirq.GridQubit(0, 0)
      5 
      6 # Create a circuit

AttributeError: module 'cirq' has no attribute 'GridQubit'

这个问题有什么解决办法吗？