Temperature sensing with ADS1115
You have to apply higher-order polynomial regression (second-order is enough) for establishing the relationship. There is a built-in function in Matlab and GNU Octave for establishing the relationship.
Besides, you may apply gradient descent to find the relationship (which is really tough).
I always use Octave for algorithm development. It's free and just 300 MB. Matlab is bulky and costly. All you have to do is to copy and paste the chart in a txt file.
https://github.com/SadatRafi/Thermistor-Curve-Fitting-Octave  I've uploaded my octave code and details in GitHub. I hope it might be helpful.