Add script for basic testing

[Ricocotam]

Feature

Add a script for some basic testing such as finding batch size, testing just the dataset or just the network.

Motivation

When we are developing a new model we want to test parts of our pipeline before pursuing coding. Having a tool to just test some parts (e.g. : dataset, network creation/forward) and some setting tests before starting training (e.g. : batch size) would ease the use of the framework.

Example of use

I imagine something like :

• python -m bootstrap.test --batch_size 50 80 100 --options /path/to/options
• python -m bootstrap.test --network forward --options /path/to/options
• python -m bootstrap.test --dataset --options /path/to/options

To test networks we would need datasets to generate empty items (so we don't need to load an entire dataset) so we can feed the network with batches really fast.

[Cadene]

@Ricocotam
After discussing with @MicaelCarvalho, we think that it is a great idea.
For instance, it would be useful to test that our model is able to overfit a small part of the dataset, or to check the gradient.
However, it's not a priority for now to us.
Feel free to suggest any crazy ideas or implementations which is not something that pytest already does.

Best