This is an extension to pystematic that adds functionality related to running machine learning experiments in pytorch. Its main contribution is the Context object and related classes. Which provides an easy way to manage all pytorch related objects.

Installation

All you have to do for pystematic to find the plugin is to install it:

$ pip install pystematic-torch

Example

Here's a small example that shows how using the Context object, SmartDataLoader and Recorder simplifies setting up and running a training session in pytorch.

import pystematic

@pystematic.experiment
def context_example(params):
    ctx = pystematic.torch.Context()

    ctx.epoch = 0

    ctx.recorder = pystematic.torch.Recorder()

    ctx.model = torch.nn.Sequential(
        torch.nn.Linear(2, 1),
        torch.nn.Sigmoid()
    )

    ctx.optimzer = torch.optim.SGD(ctx.model.parameters(), lr=0.01)

    # We use the smart dataloader so that batches are moved to 
    # the correct device
    ctx.dataloader = pystematic.torch.SmartDataLoader(
        dataset=Dataset(),
        batch_size=2
    )
    ctx.loss_function = torch.nn.BCELoss()

    ctx.cuda() # Move everything to cuda 
    # ctx.ddp() # and maybe distributed data-parallel?

    if params["checkpoint"]:
        # Load checkpoint
        ctx.load_state_dict(pystematic.torch.load_checkpoint(params["checkpoint"]))

    # Train one epoch
    for input, lbl in ctx.dataloader:
        # The smart dataloader makes sure the batch is placed on 
        # the correct device.
        output = ctx.model(input)

        loss = ctx.loss_function(output, lbl)

        ctx.optimzer.zero_grad()
        loss.backward()
        ctx.optimzer.step()

        ctx.recorder.scalar("train/loss", loss)
        ctx.recorder.step()

    ctx.epoch += 1

    # Save checkpoint
    pystematic.torch.save_checkpoint(ctx.state_dict(), id=ctx.epoch)

Documentation

Reference documentation is available at https://pystematic-torch.readthedocs.io.