Here we show you how to get started and a few simple features work.

Gigantum starts in the Projects listing page.

1. To create a new Project, click on the Add Project card
   • Enter a title of lowercase alphanumeric strings, including hyphens. No spaces or capitals!
   • Put in a description. This is a short record of why you made the Project.

2. Next pick a base for your Project.

A base is a pre-built Docker image that includes the operating system, development tools, and optionally a preconfigured set of packages. It is the starting point for your work environment.

• For this simple walk-through, click the python3 tab and choose the Select button on the Python3 Minimal card. The Python3 Minimal base has no pre-installed packages so it should download faster.
• Click Create Project to create the new Project.

Another available base is Python3 Data Science Quick-Start which has a pre-installed set of data science packages like numpy, scipy, scikit-learn and matplotlib. This will take longer to download.

Once creation of the Project is complete, the app takes you to the Project Overview. The Overview is a quick look at the Project and includes things like recent Activity, a summary of the Environment configuration, and Favorite files.

3. Start JupyterLab.
   • In the upper right corner is a status widget for the Project state. It is both a state indicator (e.g. stopped, building, running) and a button to change states.
   • For a new Project, the initial status is Stopped.
   • Mouse over the button and click on Run to start the Project. The status will transition to Starting, and then to Running.
   • Click on the Open Jupyter button to open JupyterLab in a new browser tab. Just make sure the popup doesn't get blocked!

You now have two open browser tabs, one with Gigantum and one with JupyterLab.

JupyterLab is now running! Let's start with the basics.

You will see three directories in the left tab of JupyterLab.

• code: Gigantum stores Jupyter notebooks in code. This is where you should put notebooks and other code you may need.
• input: Gigantum gives you a clear place where you can put your input data.
• output: Again, Gigantum gives you a clear place for your output data and figures.

If you don't like working with relative paths, the absolute path to these directories is always available when working in a Project from the environment variables LB_CODE, LB_INPUT, and LB_OUTPUT.

Use these directories to help you, collaborators, and the world know where to look for your stuff when opening your Project.

1. Double click into code in the left pane of Jupyter.
2. Create a notebook by clicking Python3 in the Notebook section of the Launcher pane.
3. Enter print("hello, world!") in the first cell and run it.
4. Go to the Activity Feed

We know that printing "hello, world" is pretty exciting, but you will typically need additional packages installed to do your work. Luckily, in Gigantum you can change the environment with package managers like pip, conda, and apt.

Let's add the latest versions of numpy and matplotlib as a demonstration:

1. Go to the Project in your browser.
2. Use the status widget to Stop your Project.
3. Navigate to the Project "Environment" section.
4. Click on the pip tab and then expand the "Add Packages" Section.
5. Enter the packages to install (e.g. numpy, matplotlib).
6. Click Install Selected Packages.
7. Wait for the Project state to go from "Building" to "Stopped".
8. Start the Project with the status widget and open up JupyterLab again.

There are a few things to keep in mind when adding packages with Gigantum.

• You must Stop the Project before changing packages!
• You can specify a specific version of the package or leave it blank. If the version is omitted, the latest version of the package will be installed.
• Gigantum always "pins" versions when possible to help provide reproducibility, but
  note that apt managed packages currently are not pinned.
• conda can take a long time to return from queries and install commands, so be patient when using it.

Finally, you can also install things via a "Custom Docker snippet" for things that aren't available in package managers. Simply enter valid dockerfile instructions and Gigantum will include them in the build process. Currently only RUN, ENV and comments are supported.

When you Run a Project and work in JupyterLab, Gigantum tracks your activity and builds a rich, searchable history based on the Jupyter notebooks you use. Everything is in the Activity Feed, which you can find by clicking on the Activity tab in the Project Overview.

Let's add some code to a Jupyter notebook to see the Activity Feed in action. We can also verify that the environment changes we just made worked.

Run your Project and open Jupyter as before. The snippet below is a simplified version of a matplotlib demo.

import matplotlib.pyplot as plt
from matplotlib.colors import BoundaryNorm
from matplotlib.ticker import MaxNLocator
import numpy as np

# generate data
dx, dy = 0.05, 0.05
y, x = np.mgrid[slice(1, 5 + dy, dy), slice(1, 5 + dx, dx)]
z = np.sin(x)**10 + np.cos(10 + y*x) * np.cos(x)
z = z[:-1, :-1]
levels = MaxNLocator(nbins=15).tick_values(z.min(), z.max())

# set colormap and normalize
cmap = plt.get_cmap('PiYG')
norm = BoundaryNorm(levels, ncolors=cmap.N, clip=True)
fig, (ax0) = plt.subplots(nrows=1)

# configure contours and output
cf = ax0.contourf(x[:-1, :-1] + dx/2.,
                  y[:-1, :-1] + dy/2., z, levels=levels,
                  cmap=cmap)
fig.colorbar(cf, ax=ax0)
ax0.set_title('contourf with levels')
fig.tight_layout()
plt.savefig("../output/pcolormesh")

Paste it into a cell in your Jupyter Notebook, click save, and execute the cell

Once the cell has successfully executed, Gigantum will automatically extract useful information (e.g. the file that has changed, code executed, and figure created) and create a new version of your Project.

If you navigate back to the browser tab running Gigantum and select the Activity tab, you'll see a new Activity Record summarizing what was done. Here, Gigantum has captured the output, linked with the code and environment that generated it.

Each record in the activity feed is a version that can be reproduced, modified, or shared. A user can go back to any point in time to recreate their previous work and use previous results as a starting point for new data explorations!

When you are done working on your Project, click "Stop" to shut off the container and clean up resources.