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#!/usr/bin/env python
"""Implementation of exploit vs explore ratio algorithm as described in:
**Goldberg J. H., Kotval X. P. (1999).**
*Computer interface evaluation using eye movements: methods and constructs.*
International Journal of Industrial Ergonomics (631–645).
[https://doi.org/10.1016/S0169-8141(98)00068-7](https://doi.org/10.1016/S0169-8141\\(98\\)00068-7)
**Dehais F., Peysakhovich V., Scannella S., Fongue J., Gateau T. (2015).**
*Automation surprise in aviation: Real-time solutions.*
Proceedings of the 33rd annual ACM conference on Human Factors in Computing Systems (2525–2534).
[https://doi.org/10.1145/2702123.2702521](https://doi.org/10.1145/2702123.2702521)
"""
__author__ = "Théo de la Hogue"
__credits__ = []
__copyright__ = "Copyright 2023, Ecole Nationale de l'Aviation Civile (ENAC)"
__license__ = "BSD"
from dataclasses import dataclass, field
from argaze import GazeFeatures
import numpy
@dataclass
class ScanPathAnalyzer(GazeFeatures.ScanPathAnalyzer):
"""
Parameters:
short_fixation_duration_threshold: time below which a fixation is considered to be short and so as exploratory.
"""
short_fixation_duration_threshold: float = field(default=0.)
def __post_init__(self):
super().__init__()
self.__exploit_explore_ratio = 0.
def analyze(self, scan_path: GazeFeatures.ScanPathType):
"""Analyze scan path."""
assert(len(scan_path) > 1)
short_fixations_durations = []
long_fixations_durations = []
saccades_durations = []
for scan_step in scan_path:
if scan_step.first_fixation.duration > self.short_fixation_duration_threshold:
long_fixations_durations.append(scan_step.first_fixation.duration)
else:
short_fixations_durations.append(scan_step.first_fixation.duration)
saccades_durations.append(scan_step.last_saccade.duration)
short_fixations_duration = numpy.array(short_fixations_durations).sum()
long_fixations_duration = numpy.array(long_fixations_durations).sum()
saccades_duration = numpy.array(saccades_durations).sum()
assert(saccades_duration + short_fixations_duration > 0)
self.__exploit_explore_ratio = long_fixations_duration / (saccades_duration + short_fixations_duration)
@property
def exploit_explore_ratio(self) -> float:
return self.__exploit_explore_ratio
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