Back-to-back testing is a method where the same set of tests are run on multiple implementations of

the system to compare their outputs. This type of testing is typically used to ensure consistency and

correctness by comparing the outputs of different implementations under identical conditions. Let's

analyze the options given:

A . Comparison of the results of a current neural network model ML model implemented in platform

A (for example Pytorch) with a similar neural network model ML model implemented in platform B

(for example Tensorflow), for the same data.

This option describes a scenario where two different implementations of the same type of model are

being compared using the same dataset. This is a typical back-to-back testing situation.

B . Comparison of the results of a home-grown neural network model ML model with results in a

neural network model implemented in a standard implementation (for example Pytorch) for the

same data.

This option involves comparing a custom implementation with a standard implementation, which is

also a typical back-to-back testing scenario to validate the custom model against a known

benchmark.

C . Comparison of the results of a neural network ML model with a current decision tree ML model

for the same data.

This option involves comparing two different types of models (a neural network and a decision tree).

This is not a typical scenario for back-to-back testing because the models are inherently different and

would not be expected to produce identical results even on the same data.

D . Comparison of the results of the current neural network ML model on the current data set with a

slightly modified data set.

This option involves comparing the outputs of the same model on slightly different datasets. This

could be seen as a form of robustness testing or sensitivity analysis, but not typical back-to-back

testing as it doesn’t involve comparing multiple implementations.

Based on this analysis, option C is the one that describes a situation of back-to-back testing the least

because it compares two fundamentally different models, which is not the intent of back-to-back

testing.