'WaveFunctionTrialResult' object has no attribute 'final_state_vector';'SingleQubitPauliStringGateOperation' object has no attribute 'expectation_from_state_vector';'PauliSum' object has no attribute 'expectation_from_state_vector'

[baishuili]

The following error occurs, when I run the "Hello, many worlds" of tutorials locally. The rest code of "Hello, many worlds", however, works fine.

tensorflow version 2.1.0 tensorflow-quantum version 0.3.1 install through anaconda3

import importlib, pkg_resources importlib.reload(pkg_resources) import tensorflow as tf import tensorflow_quantum as tfq import cirq import sympy import numpy as np

%matplotlib inline import matplotlib.pyplot as plt from cirq.contrib.svg import SVGCircuit

a, b = sympy.symbols('a b') q0, q1 = cirq.GridQubit.rect(1, 2) circuit = cirq.Circuit( cirq.rx(a).on(q0), cirq.ry(b).on(q1), cirq.CNOT(control=q0, target=q1))

SVGCircuit(circuit)

resolver = cirq.ParamResolver({a: 0.5, b: -0.5}) output_state_vector = cirq.Simulator().simulate(circuit, resolver).final_state_vector output_state_vector AttributeError Traceback (most recent call last) in 1 # Calculate a state vector with a=0.5 and b=-0.5. 2 resolver = cirq.ParamResolver({a: 0.5, b: -0.5}) ----> 3 output_state_vector = cirq.Simulator().simulate(circuit, resolver).final_state_vector 4 5 output_state_vector

AttributeError: 'WaveFunctionTrialResult' object has no attribute 'final_state_vector'

z0 = cirq.Z(q0)

qubit_map={q0: 0, q1: 1}

z0.expectation_from_state_vector(output_state_vector, qubit_map).real AttributeError Traceback (most recent call last) in 3 qubit_map={q0: 0, q1: 1} 4 ----> 5 z0.expectation_from_state_vector(output_state_vector, qubit_map).real

AttributeError: 'SingleQubitPauliStringGateOperation' object has no attribute 'expectation_from_state_vector'

z0x1 = 0.5 * z0 + cirq.X(q1)

z0x1.expectation_from_state_vector(output_state_vector, qubit_map).real AttributeError Traceback (most recent call last) in 1 z0x1 = 0.5 * z0 + cirq.X(q1) 2 ----> 3 z0x1.expectation_from_state_vector(output_state_vector, qubit_map).real

AttributeError: 'PauliSum' object has no attribute 'expectation_from_state_vector'

[lockwo]

Likely because TFQ 0.3.1 uses cirq 0.8.0 and that function wasn't implemented yet (there was a expectation_from_wavefunction but no expectation_from_state_vector).

[baishuili]

Oh, thanks, but could you tell me how to upgrade TFQ on Anaconda?

[lockwo]

pip install -U tensorflow-quantum

[lockwo]

Any updates on this or should it be closed?