Machine Learning correction

We have created a machine learning code (random forest) that classifies extremely well (accuracy 0.9+). It was trained with 10 fold cross validation and out of box against overfitting. A 0.2/0.8 SPlit was made (0.2 testset).

The data set originally consisted of 81 test persons (healthy/ill). 90 lines each are

a test person. So we have a total of 7200 observations. If we are using classic

train/test split and work against overfitting out of bag and 10fold cross

we come in the randomized sampels to an acc. of over 0.9.

Then we thought that we would randomly take out some probands (e.g. the first 20)

say: 1800 lines. We train again with the remaining data set

and reach an acc. of again 0.9 or more on the 0.2 testset.

However, if the algorithm is now applied to the 1800 omitted lines

it predicted only one class and thus has an acc. of 0.5 and

is "useless."

Skills: Algorithm, Artificial Intelligence, Machine Learning (ML), Python

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