Skip to content

Commit

Permalink
Initial commit.
Browse files Browse the repository at this point in the history 
PiperOrigin-RevId: 552468745
Change-Id: I80fa5da6affac67509658b464302fc4fe6982c8f
  • Loading branch information
@tewalds
Deepmind Weather authored and tewalds committed Jul 31, 2023
0 parents commit e622a15
Show file tree
Hide file tree
Showing 28 changed files with 7,839 additions and 0 deletions.
25 changes: 25 additions & 0 deletions CONTRIBUTING.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
# How to Contribute

## Contributor License Agreement

Contributions to this project must be accompanied by a Contributor License
Agreement. You (or your employer) retain the copyright to your contribution,
this simply gives us permission to use and redistribute your contributions as
part of the project. Head over to <https://cla.developers.google.com/> to see
your current agreements on file or to sign a new one.

You generally only need to submit a CLA once, so if you've already submitted one
(even if it was for a different project), you probably don't need to do it
again.

## Code reviews

All submissions, including submissions by project members, require review. We
use GitHub pull requests for this purpose. Consult
[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
information on using pull requests.

## Community Guidelines

This project follows [Google's Open Source Community
Guidelines](https://opensource.google/conduct/).
202 changes: 202 additions & 0 deletions LICENSE
Original file line number Diff line number Diff line change
@@ -0,0 +1,202 @@

Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/

TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION

1. Definitions.

"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.

"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.

"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.

"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.

"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.

"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.

"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).

"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.

"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."

"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.

2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.

3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.

4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:

(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and

(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and

(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and

(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must
include a readable copy of the attribution notices contained
within such NOTICE file, excluding those notices that do not
pertain to any part of the Derivative Works, in at least one
of the following places: within a NOTICE text file distributed
as part of the Derivative Works; within the Source form or
documentation, if provided along with the Derivative Works; or,
within a display generated by the Derivative Works, if and
wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
as modifying the License.

You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
reproduction, and distribution of the Work otherwise complies with
the conditions stated in this License.

5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.

6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
origin of the Work and reproducing the content of the NOTICE file.

7. Disclaimer of Warranty. Unless required by applicable law or
agreed to in writing, Licensor provides the Work (and each
Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied, including, without limitation, any warranties or conditions
of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.

8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
has been advised of the possibility of such damages.

9. Accepting Warranty or Additional Liability. While redistributing
the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.

END OF TERMS AND CONDITIONS

APPENDIX: How to apply the Apache License to your work.

To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
comment syntax for the file format. We also recommend that a
file or class name and description of purpose be included on the
same "printed page" as the copyright notice for easier
identification within third-party archives.

Copyright [yyyy] [name of copyright owner]

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
127 changes: 127 additions & 0 deletions README.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,127 @@
# GraphCast: Learning skillful medium-range global weather forecasting

This package contains example code to run and train [GraphCast](https://arxiv.org/abs/2212.12794).
It also provides three pretrained models:

1. `GraphCast`, the high-resolution model used in the GraphCast paper (0.25 degree
resolution, 37 pressure levels), trained on ERA5 data from 1979 to 2017,

2. `GraphCast_small`, a smaller, low-resolution version of GraphCast (1 degree
resolution, 13 pressure levels, and a smaller mesh), trained on ERA5 data from
1979 to 2015, useful to run a model with lower memory and compute constraints,

3. `GraphCast_operational`, a high-resolution model (0.25 degree resolution, 13
pressure levels) pre-trained on ERA5 data from 1979 to 2017 and fine-tuned on
HRES data from 2016 to 2021. This model can be initialized from HRES data (does
not require precipitation inputs).

The model weights, normalization statistics, and example inputs are available on [Google Cloud Bucket](https://console.cloud.google.com/storage/browser/dm_graphcast).

Full model training requires downloading the
[ERA5](https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5)
dataset, available from [ECMWF](https://www.ecmwf.int/).

## Overview of files

The best starting point is to open `graphcast_demo.ipynb` in [Colaboratory](https://colab.research.google.com/github/deepmind/graphcast/blob/master/graphcast_demo.ipynb), which gives an
example of loading data, generating random weights or load a pre-trained
snapshot, generating predictions, computing the loss and computing gradients.
The one-step implementation of GraphCast architecture, is provided in
`graphcast.py`.

### Brief description of library files:

* `autoregressive.py`: Wrapper used to run (and train) the one-step GraphCast
to produce a sequence of predictions by auto-regressively feeding the
outputs back as inputs at each step, in JAX a differentiable way.
* `casting.py`: Wrapper used around GraphCast to make it work using
BFloat16 precision.
* `checkpoint.py`: Utils to serialize and deserialize trees.
* `data_utils.py`: Utils for data preprocessing.
* `deep_typed_graph_net.py`: General purpose deep graph neural network (GNN)
that operates on `TypedGraph`'s where both inputs and outputs are flat
vectors of features for each of the nodes and edges. `graphcast.py` uses
three of these for the Grid2Mesh GNN, the Multi-mesh GNN and the Mesh2Grid
GNN, respectively.
* `graphcast.py`: The main GraphCast model architecture for one-step of
predictions.
* `grid_mesh_connectivity.py`: Tools for converting between regular grids on a
sphere and triangular meshes.
* `icosahedral_mesh.py`: Definition of an icosahedral multi-mesh.
* `losses.py`: Loss computations, including latitude-weighting.
* `model_utils.py`: Utilities to produce flat node and edge vector features
from input grid data, and to manipulate the node output vectors back
into a multilevel grid data.
* `normalization.py`: Wrapper for the one-step GraphCast used to normalize
inputs according to historical values, and targets according to historical
time differences.
* `predictor_base.py`: Defines the interface of the predictor, which GraphCast
and all of the wrappers implement.
* `rollout.py`: Similar to `autoregressive.py` but used only at inference time
using a python loop to produce longer, but non-differentiable trajectories.
* `typed_graph.py`: Definition of `TypedGraph`'s.
* `typed_graph_net.py`: Implementation of simple graph neural network
building blocks defined over `TypedGraph`'s that can be combined to build
deeper models.
* `xarray_jax.py`: A wrapper to let JAX work with `xarray`s.
* `xarray_tree.py`: An implementation of tree.map_structure that works with
`xarray`s.


### Dependencies.

[Chex](https://github.com/deepmind/chex),
[Dask](https://github.com/dask/dask),
[Haiku](https://github.com/deepmind/dm-haiku),
[JAX](https://github.com/google/jax),
[JAXline](https://github.com/deepmind/jaxline),
[Jraph](https://github.com/deepmind/jraph),
[Numpy](https://numpy.org/),
[Pandas](https://pandas.pydata.org/),
[Python](https://www.python.org/),
[SciPy](https://scipy.org/),
[Tree](https://github.com/deepmind/tree),
[Trimesh](https://github.com/mikedh/trimesh) and
[XArray](https://github.com/pydata/xarray).


### License and attribution

The Colab notebook and the associated code are licensed under the Apache
License, Version 2.0. You may obtain a copy of the License at:
https://www.apache.org/licenses/LICENSE-2.0.

The model weights are made available for use under the terms of the Creative
Commons Attribution-NonCommercial-ShareAlike 4.0 International
(CC BY-NC-SA 4.0). You may obtain a copy of the License at:
https://creativecommons.org/licenses/by-nc-sa/4.0/.

The weights were trained on ECMWF's ERA5 and HRES data. The colab includes a few
examples of ERA5 and HRES data that can be used as inputs to the models.
ECMWF data product are subject to the following terms:

1. Copyright statement: Copyright "© 2023 European Centre for Medium-Range Weather Forecasts (ECMWF)".
2. Source www.ecmwf.int
3. Licence Statement: ECMWF data is published under a Creative Commons Attribution 4.0 International (CC BY 4.0). https://creativecommons.org/licenses/by/4.0/
4. Disclaimer: ECMWF does not accept any liability whatsoever for any error or omission in the data, their availability, or for any loss or damage arising from their use.

### Disclaimer

This is not an officially supported Google product.

Copyright 2023 DeepMind Technologies Limited.

### Citation

If you use this work, consider citing our [paper](https://arxiv.org/abs/2212.12794):

```latex
@article{lam2022graphcast,
title={GraphCast: Learning skillful medium-range global weather forecasting},
author={Remi Lam and Alvaro Sanchez-Gonzalez and Matthew Willson and Peter Wirnsberger and Meire Fortunato and Alexander Pritzel and Suman Ravuri and Timo Ewalds and Ferran Alet and Zach Eaton-Rosen and Weihua Hu and Alexander Merose and Stephan Hoyer and George Holland and Jacklynn Stott and Oriol Vinyals and Shakir Mohamed and Peter Battaglia},
year={2022},
eprint={2212.12794},
archivePrefix={arXiv},
primaryClass={cs.LG}
}
```
Loading

0 comments on commit e622a15

Please sign in to comment.