로컬 설정¶

Qiskit을 설치하고 실행하면 특정한 활용 예시에 대한 Qiskit의 기본 작동을 변경할 수 있는 선택적인 구성 단계가 있다.

사용자 구성 파일¶

Qiskit의 로컬 구성을 위한 기본 위치는 사용자 구성 파일이다. 이는 Qiskit 에서 기본값을 변경하는 데 사용할 수 있는 “ini <https://en.wikipedia.org/wiki/INI_file>” 형식 파일이다.

예시:

[default]
circuit_drawer = mpl
circuit_mpl_style = default
circuit_mpl_style_path = ~:~/.qiskit
state_drawer = hinton
transpile_optimization_level = 3
parallel = False
num_processes = 15

기본적으로 이 파일은~~/.qiskit/settings.conf에 있지만 사용되는 경로는 ` ` QISKIT_SETTINGS ” 환경 변수로 대체될 수 있다. ` ` QISKIT_SETTINGS ” 값이 설정되면 사용자 구성 파일에 대한 경로로 사용된다.

사용 가능한 옵션

circuit_drawer: This is used to change the default backend for the circuit drawer qiskit.circuit.QuantumCircuit.draw() and qiskit.visualization.circuit_drawer(). It can be set to latex, mpl, text, or latex_source and when the ouptut kwarg is not explicitly set that drawer backend will be used.

circuit_mpl_style: This is the default style sheet used for the mpl output backend for the circuit drawer qiskit.circuit.QuantumCircuit.draw() and qiskit.visualization.circuit_drawer(). It can be set to default or bw.

circuit_mpl_style_path: This can be used to set the path(s) to have the circuit drawer, qiskit.circuit.QuantumCircuit.draw() or qiskit.visualization.circuit_drawer(), use to look for json style sheets when using the mpl output mode.

state_drawer: This is used to change the default backend for the state visualization draw methods qiskit.quantum_info.Statevector.draw() and qiskit.quantum_info.DensityMatrix.draw(). It can be set to repr, text’, latex, latex_source, qsphere, hinton, or bloch bloch and when the output kwarg is not explicitly set on the draw() method that output method will be used.

transpile_optimization_level: This takes an integer between 0-3 and is used to change the default optimization level for transpile() and execute().

parallel: This option takes a boolean value (either True or False) and is used to configure whether Python multiprocessing is enabled for operations that support running in parallel (for example transpilation of multiple QuantumCircuit objects). The default setting in the user config file can be overriden by the QISKIT_PARALLEL environment variable.

num_processes: This option takes an integer value (> 0) that is used to specify the maximum number of parallel processes to launch for parallel operations if parallel execution is enabled. The default setting in the user config file can be overriden by the QISKIT_NUM_PROCS environment variable.

환경 변수¶

Qiskit의 기본 동작을 변경하기 위해 설정할 수 있는 몇 가지 환경 변수도 있다.

QISKIT_PARALLEL: if this variable is set to TRUE it will enable the use of Python multiprocessing to parallelize certain operations (for example transpilation over multiple circuits) in Qiskit Terra.

QISKIT_NUM_PROCS: Specifies the maximum number of parallel processes to launch for parallel operations if parallel execution is enabled. It takes an integer > 0 as the expected value.

QISKIT_IBMQ_PROVIDER_LOG_LEVEL: Specifies the log level to use, for the qiskit-ibmq-provider modules. If an invalid level is set, the log level defaults to WARNING. The valid log levels are DEBUG, INFO, WARNING, ERROR, and CRITICAL (case-insensitive). If the environment variable is not set, then the parent logger’s level is used, which also defaults to WARNING.

QISKIT_IBMQ_PROVIDER_LOG_FILE: Specifies the name of the log file to use from log messages originating from qiskit-ibmq-provider. If specified, messages will be logged to the file only. Otherwise messages will be logged to the standard error (usually the screen).

QISKIT_AQUA_MAX_GATES_PER_JOB: An optional parameter to set a threshold for splitting Aqua generated circuits up into multiple jobs submitted to a backend based on the number of gates.