Example notebooks out of date

The recent api updates (i.e. separating models, utils.prediction etc into tensorflow and pytorch) mean a number of the example notebooks are now out-of-date. Some examples below:

• Many examples load in predict_batch as from alibi_detect.utils.prediction import predict_batch instead of from alibi_detect.utils.tensorflow.prediction import predict_batch. The arguments and use of predict_batch also needs updating i.e. clf is now the second argument, and the absence of return_class arg means these notebooks need reworking to convert prediction proba’s to classes (or this functionality needs to be added back in internally). e.g. see examples/cd_distillation_cifar10.ipynb.
• Some fetch methods (such as fetch_vaegmm used in examples/od_aegmm_kddcup.ipynb fail when attempting to load state from meta.pickle files. These files need to be updated to match the new api (or this can be fixed on the code side with sub-classes, aliases etc).
• General updates to imports in notebooks needed.

The above is not exhaustive. A general sweep to check all the examples is needed.

[ascillitoe]

@jklaise I didn’t want to cause confusion by editing your comment, but perhaps you can add these to the list of notebooks with errors:

• od_if_kddcup.ipynb - AttributeError: 'IsolationForest' object has no attribute 'n_features_' from sklearn iforest. Is this new? I know we had an issue with an outdated module name in the saved detector, but wasn’t aware of this issue.
• cd_text_imdb.ipynb - Timeout. Don’t know how long this takes, we might be able to adjust the notebook (or timeout limit?) slightly.

These were uncovered in https://github.com/SeldonIO/alibi-detect/pull/402. We should probably also have a second look at the weekly CI test results.

Also, because the two below are still failing, we probably want to add these to EXCLUDE_NOTEBOOKS until we update remote artefacts.

• od_prophet_weather.ipynb - outdated metadata files causing fetch to fail
• ad_ae_cifar10.ipynb - cannot deserialized saved detector - needs updating

[ascillitoe]

Good spot, I missed these, and guess they weren’t flagged up as sphinx errors as they’re absolute url’s as opposed to relative links to sphinx source. I’ll grep all absolute links and fix.