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---
title: AccreditationFitter
description: API reference for qiskit.ignis.verification.AccreditationFitter
in_page_toc_min_heading_level: 1
python_api_type: class
python_api_name: qiskit.ignis.verification.AccreditationFitter
---
# qiskit.ignis.verification.AccreditationFitter
<Class id="qiskit.ignis.verification.AccreditationFitter" isDedicatedPage={true} github="https://github.com/qiskit-community/qiskit-ignis/tree/stable/0.6/qiskit/ignis/verification/accreditation/fitters.py" signature="AccreditationFitter" modifiers="class">
Class for fitters for accreditation
Implementation follows the methods from Samuele Ferracin, Theodoros Kapourniotis and Animesh Datta New Journal of Physics, Volume 21, November 2019 [https://iopscience.iop.org/article/10.1088/1367-2630/ab4fd6](https://iopscience.iop.org/article/10.1088/1367-2630/ab4fd6)
### \_\_init\_\_
<Function id="qiskit.ignis.verification.AccreditationFitter.__init__" signature="__init__()">
Initialize self. See help(type(self)) for accurate signature.
</Function>
## Methods
| | |
| ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| [`__init__`](#qiskit.ignis.verification.AccreditationFitter.__init__ "qiskit.ignis.verification.AccreditationFitter.__init__")() | Initialize self. |
| [`bound_variation_distance`](#qiskit.ignis.verification.AccreditationFitter.bound_variation_distance "qiskit.ignis.verification.AccreditationFitter.bound_variation_distance")(theta) | This function computes the bound on variation distance based and the confidence |
| [`single_protocol_run`](#qiskit.ignis.verification.AccreditationFitter.single_protocol_run "qiskit.ignis.verification.AccreditationFitter.single_protocol_run")(results, postp\_list, v\_zero) | Single protocol run of accreditation protocol on simul backend |
## Attributes
| | |
| ------------ | - |
| `N_acc` | |
| `bound` | |
| `confidence` | |
| `flag` | |
| `g_num` | |
| `num_runs` | |
| `num_traps` | |
| `outputs` | |
### bound\_variation\_distance
<Function id="qiskit.ignis.verification.AccreditationFitter.bound_variation_distance" signature="bound_variation_distance(theta)">
This function computes the bound on variation distance based and the confidence
**Parameters**
**theta** (*float*) number between 0 and 1
</Function>
### single\_protocol\_run
<Function id="qiskit.ignis.verification.AccreditationFitter.single_protocol_run" signature="single_protocol_run(results, postp_list, v_zero)">
Single protocol run of accreditation protocol on simul backend
**Parameters**
* **results** ([*Result*](qiskit.result.Result "qiskit.result.Result")) results of the quantum job
* **postp\_list** (*list*) list of strings used to post-process outputs
* **v\_zero** (*int*) position of target
</Function>
</Class>