Pepper implementation of the cognitive architecture for Trust and Theory of Mind in humanoid robots applied to the developmental psychology experiment designed by Vanderbilt et al. (2011).
In this experiment, a robot will interact with one or more informants in a sticker finding game and it will progressively learn to predict their trustworthiness. For more details, please refer to Vinanzi et al. (2019): https://royalsocietypublishing.org/doi/10.1098/rstb.2018.0032
- Robotic vision algorithms to detect and recognize user's faces other than the markers: Haar Cascade for face detection, Local Binary Histogram Patterns (LBPH) for face recognition;
- Interaction through vocal commands and NAOmarker detection provided by QI APIs;
- Developmental Bayesian Model of Trust (Patacchiola and Cangelosi, 2016) used as a belief network;
- Maximum Likelihood Estimation and Message Passing Algorithm for bayesian learning and inference;
- Custom particle-filter-inspired algorithm for artificial episodic memory;
This code runs on Python 2.7. In addition, the following libraries are required:
| Library | GitHub URL |
|---|---|
| Numpy | https://github.com/numpy/numpy.git |
| Bayesian Belief Networks | https://github.com/samvinanzi/bayesian-belief-networks.git |
| OpenCV2 with "face" extra module | https://github.com/opencv/opencv_contrib.git |
| qi | https://github.com/aldebaran/libqi.git |
This software can operate in a simulated virtual environment, provided a camera is connected to the computer at runtime, but for best results a SoftBank robot (Nao or Pepper, for example) of latest generation is recommended.
This module has been written for a SoftBank Pepper robot.
The original experimental setup involved a table measuring 67.5 cm in height located at a distance of 30 cm from the robot. Some robotic behaviours (as methods look_A() and look_B() from class robot.py) should be revised in case of any changes to the robot or the experimental setup.
Printable images of the experiment mat and the marker are available for download and print. Although the table mat is not mandatory, it is recommended as it serves as a visual guide for both the pointers and the experimenters. Any kind of NAOmarker can be used in place of the one provided.
Tabletop mat (recommended print size is A3):
Marker:
from Vanderbilt import Vanderbilt
robot_ip = "pepper.local"
simulation = False
demo_number = 6
mature = True
withUpdate = True
experiment = Vanderbilt(robot_ip, simulation, demo_number, mature, withUpdate)
experiment.help_setup() # Optional, helps to setup the physical environment
experiment.start()