https://github.com/kimhc6028/relational-networks

Python
Pytorch implementation of "A simple neural network module for relational reasoning" (Relational Networks)

Pytorch implementation of Relational Networks - A simple neural network module for relational reasoning

Implemented & tested on Sort-of-CLEVR task.

Sort-of-CLEVR

Sort-of-CLEVR is simplified version of CLEVR.This is composed of 10000 images and 20 questions (10 relational questions and 10 non-relational questions) per each image. 6 colors (red, green, blue, orange, gray, yellow) are assigned to randomly chosen shape (square or circle), and placed in a image.

Non-relational questions are composed of 3 subtypes:

1. Shape of certain colored object
2. Horizontal location of certain colored object : whether it is on the left side of the image or right side of the image
3. Vertical location of certain colored object : whether it is on the upside of the image or downside of the image

Theses questions are "non-relational" because the agent only need to focus on certain object.

Relational questions are composed of 3 subtypes:

1. Shape of the object which is closest to the certain colored object
2. Shape of the object which is furthest to the certain colored object
3. Number of objects which have the same shape with the certain colored object

These questions are "relational" because the agent has to consider the relations between objects.

Questions are encoded into a vector of size of 11 : 6 for one-hot vector for certain color among 6 colors, 2 for one-hot vector of relational/non-relational questions. 3 for one-hot vector of 3 subtypes.

I.e., with the sample image shown, we can generate non-relational questions like:

1. What is the shape of the red object? => Circle (even though it does not really look like "circle"...)
2. Is green object placed on the left side of the image? => yes
3. Is orange object placed on the upside of the image? => no

And relational questions:

1. What is the shape of the object closest to the red object? => square
2. What is the shape of the object furthest to the orange object? => circle
3. How many objects have same shape with the blue object? => 3

Requirements

• Python 2.7
• numpy
• pytorch
• opencv

Usage

$ ./run.sh

or

$ python sort_of_clevr_generator.py

to generate sort-of-clevr dataset and

 $ python main.py 

to train.

Result

	Relational Networks (3rd epoch)	CNN + MLP (without RN, 10th epoch)
Non-relational question	57%	58%
Relational question	70%	43%

Relational networks shows far better results in relational questions, as the original paper argues.

Still this model shows low accuracy overall - I guess it could be the problem of either the architecture of the model, or difference between my dataset and the author's dataset. Please wait for further improvement! (and your pull requests are always welcome!)