Migrate DeepIV to new TensorFlow API or PyTorch

[kbattocchi]

Our implementation of DeepIV relies on very outdated versions of the keras and tensorflow APIs that are not supported by versions 3.9 or later of python.

Given that Python 3.8 will not be supported beyond October 14, 2024, this means that we will deprecate and remove this estimator unless an implementation supporting either a newer version of TensorFlow/keras or a version supporting pytorch is created.

[vojavocni]

Anyone working on this? I'm thinking of taking it.

[fverac]

Anyone working on this? I'm thinking of taking it.

Since no one has spoken up, I think you should be free to take this on

[vojavocni]

Unfortunately, I have to drop this as I'll be away from my laptop for the next month. If someone wants to take it over in the meantime, feel free, otherwise, I'll return to it when I'm available.