In that vein, I'd find it interesting to see a neural network implemented in COBOL. But I won't hold my breath :)
The first artificial neural network was invented in 1958 by psychologist Frank Rosenblatt. Called Perceptron, it was intended to model how the human brain processed visual data and learned to recognize objects. Other researchers have since used similar ANNs to study human cognition. [0]
COBOL is a high-level programming language first developed by the CODASYL Committee (Conference on Data Systems Languages) in 1960. [1]
A COBOL-like neural network simulation language based on layer macro definition [2]
Perceptron in COBOL [3]
My first program in COBOL, a single neuron neural network. [4]
[0] https://www.computerworld.com/article/2591759/artificial-neural-networks.html
[1] http://www.csis.ul.ie/cobol/course/COBOLIntro.htm
[2] https://ieeexplore.ieee.org/document/714089
[3] https://github.com/victorqribeiro/perceptronCobol
[4] https://www.reddit.com/r/programming/comments/gt8cao/my_first_program_in_cobol_a_single_neuron_neural/