added interactive regression example for NeuralNetwork class

[LudwigStumpp]

Dear ml5 community,

I'm making a Pull Request(PR). Please see the details below.

→ Step 1: Which branch are you submitting to? 🌲

development to add an example for Regression on the NeuralNetwork class

→ Step 2: Describe your Pull Request 📝

Important: This replaces ml5js/ml5-examples#257 due to examples now being added to the ml5-library repository.

I am submitting a new interactive example for Regression using the NeuralNetwork class.

Previously there were some problems with it, described at #721. Basically, the issue was that not all data points were taken into account (since the validationSplit parameter of the NeuralNetwork training option was permanently set to 0.1).

But since this issue is now closed and changes were merged to the development branch (see f749d4e; src/NeuralNetwork/NeuralNetwork.js; line 108) the example now works as expected.

The idea behind this example is that one can add multiple data points to use regression to fit a line. The already present example of NeuralNetwork_Simple_Regression does not have the feature to add points interactively + to change some core model parameters. This is why I wanted to share this example.

One can add data points and modify:

• learningRate
• hiddenUnits
• batchSize
• epochs

and see the changes.

I would not be upset if you decide not to add this example, since it might be a little bit redundant compared to NeuralNetwork_Simple_Regression.

→ Step 4: Screenshots or Relevant Documentation 🖼

Here's some helpful screenshots and/or documentation of the new feature

[joeyklee]

@bomanimc I would propose for now that we merge this into /examples for now so that others may more easily use it and then as we decide on a structure or system for "demos" we can adjust as needed.

With the proposal of the "gates.json" approach #917, we might actually add a flag that determines whether something is delivered as a Demo or a example which might allow us to then keep everything in the "examples" directory?

[joeyklee]

Merging now!