Default to Sequence Examples

[AlexanderLavelle]

This is a draft / suggestion based on 5689

Everything now goes to Sequence Examples. There is an isinstance filter to navigate the types.

This supports long-term development by natively implementing sequence type features, which TFX would need to lean on in order to support LLM training and so on.

@lego0901

[gbaned]

Hi @lego0901 Can you please review this PR ? Thank you!

[lego0901]

Hi @AlexanderLavelle, thanks a lot for your efforts on this.

We had a look at your PR and discussed internally. Unfortunately, we decided to politely reject your PR.

The main reason was "the backward compatibility". As a proto message type, SequenceExample is not compatible with the Example. What it means is that every code that uses tf.train.Example, regardless of if it is internal or external-Google, should change their way of packing the messages. We assumed that will bring a big burden to our existing customers to upgrade the TFX version.

I always appreciate your concern to our product. Sorry for my response. Thank you.