MLP demo

[jaderiverstokes]

Demo for the MLP module using MNIST data.

[fmcquillan99]

This is a really great demo workbook, thanks for posting.

Suggestions

1. concat does not work for greenplum, perhaps do:

SELECT round(count(*)*100/60000.0,2) as train_accuracy_percent from
(select mnist_train.y as actual, mnist_train_prediction.estimated_y as estimated
from mnist_train_prediction inner join mnist_train
on mnist_train.id=mnist_train_prediction.id) q
WHERE q.actual=q.estimated;

2. Can you please add a comment at the top on the parameters you used to get a good accuracy + the platform you used?

[jaderiverstokes]

Added those few changes. Should be good to merge now. I'm not sure how these demos are typically presented, but note that this demo relies on the newly created data directory in this repo. This is mentioned in the notebook itself.