diff --git a/README.md b/README.md
index 04f93ae..82c90f2 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ https://deepmind.com/research/publications/
 
 ## Projects
 
+*   [Compute-Aided Design as Language](cadl)
 *   [Encoders and ensembles for continual learning](continual_learning)
 *   [Towards mental time travel: a hierarchical memory for reinforcement learning agents](hierarchical_transformer_memory)
 *   [Perceiver IO: A General Architecture for Structured Inputs & Outputs](perceiver)
diff --git a/cadl/README.md b/cadl/README.md
new file mode 100644
index 0000000..621de43
--- /dev/null
+++ b/cadl/README.md
@@ -0,0 +1,74 @@
+# A dataset of CAD sketches
+
+<p align="center">
+  <img width="75%" src="media/sketch_data.gif" />
+</p>
+
+## Overview
+
+This repository contains the dataset used in ["Computer-Aided Design as Language"](https://arxiv.org/abs/2105.02769).
+We provide the following splits:
+  * Training (`4,656,607` sketches)
+  * Validation (`50,000` sketches)
+  * Test (`50,000` sketches)
+
+## Quickstart
+
+First, download the dataset files:
+```shell
+bash download_dataset.sh
+```
+This will place the splits under `data` subfolder.
+
+In order to read the data, you will need [protocol buffer](https://developers.google.com/protocol-buffers)
+compiler and [Tensorflow](https://www.tensorflow.org/):
+```shell
+apt install -y protobuf-compiler
+virtualenv --python=python3.6 "${ENV}"
+${ENV}/bin/activate
+pip install tensorflow
+```
+
+Next, you need to compile `.proto` files that define the layout of entries in
+the dataset:
+```shell
+protoc --python_out=. *.proto
+```
+
+Finally, you can use the generated classes to access the examples. The following
+`python` snippet reads and prints the first 5 elements from the training split:
+```python
+import tensorflow as tf
+
+import example_pb2
+
+dataset = tf.data.TFRecordDataset("data/train.tfrecord")
+
+for raw_record in dataset.take(5).as_numpy_iterator():
+  example = example_pb2.Example()
+  example.ParseFromString(raw_record)
+  print(example, "\n")
+```
+
+Please refer to `example.proto` for details on the data layout.
+
+## Citation
+
+If you use this dataset in your research, please cite:
+```
+@article{ganin2021computer,
+  title={Computer-aided design as language},
+  author={Ganin, Yaroslav and Bartunov, Sergey and Li, Yujia and Keller, Ethan and Saliceti, Stefano},
+  journal={arXiv preprint arXiv:2105.02769},
+  year={2021}
+}
+```
+
+## License
+
+The code is licensed under the [Apache 2.0 License](https://www.apache.org/licenses/LICENSE-2.0).
+The dataset is licensed under a [Creative Commons Attribution 4.0 International License](https://creativecommons.org/licenses/by/4.0/).
+
+## Disclaimer
+
+This is not an official Google product.
diff --git a/cadl/common.proto b/cadl/common.proto
new file mode 100644
index 0000000..fa87f16
--- /dev/null
+++ b/cadl/common.proto
@@ -0,0 +1,28 @@
+// Copyright 2021 Deepmind Technologies Limited.
+//
+// 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.
+
+syntax = "proto3";
+
+package deepmind.cad.protos;
+
+import "google/protobuf/descriptor.proto";
+
+message NCFieldOptions {
+  bool is_pointer = 1;
+  uint32 at_least = 2;
+}
+
+extend google.protobuf.FieldOptions {
+  NCFieldOptions nc_field_options = 50000;
+}
diff --git a/cadl/constraints.proto b/cadl/constraints.proto
new file mode 100644
index 0000000..1d670b1
--- /dev/null
+++ b/cadl/constraints.proto
@@ -0,0 +1,135 @@
+// Copyright 2021 Deepmind Technologies Limited.
+//
+// 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.
+
+syntax = "proto3";
+
+package deepmind.cad.protos;
+
+import "common.proto";
+
+message FixConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 1];
+}
+
+message CoincidentConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 2];
+}
+
+message ConcentricConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 2];
+}
+
+message EqualConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 2];
+}
+
+message ParallelConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 2];
+}
+
+message TangentConstraint {
+  uint32 first = 1 [(nc_field_options).is_pointer = true];
+  uint32 second = 2 [(nc_field_options).is_pointer = true];
+}
+
+message PerpendicularConstraint {
+  uint32 first = 1 [(nc_field_options).is_pointer = true];
+  uint32 second = 2 [(nc_field_options).is_pointer = true];
+}
+
+message MirrorConstraint {
+  uint32 mirror = 1 [(nc_field_options).is_pointer = true];
+  message MirroredPair {
+    uint32 first = 1 [(nc_field_options).is_pointer = true];
+    uint32 second = 2 [(nc_field_options).is_pointer = true];
+  }
+  repeated MirroredPair mirrored_pairs = 2 [(nc_field_options).at_least = 1];
+}
+
+message DistanceConstraint {
+  uint32 first = 1 [(nc_field_options).is_pointer = true];
+  uint32 second = 2 [(nc_field_options).is_pointer = true];
+  enum Direction {
+    HORIZONTAL = 0;
+    VERTICAL = 1;
+    MINIMUM = 2;
+  }
+  Direction direction = 3;
+  double length = 4;
+  enum Alignment {
+    ALIGNED = 0;
+    ANTI_ALIGNED = 1;
+  }
+  enum HalfSpace {
+    NOT_AVAILABLE = 0;
+    LEFT = 1;
+    RIGHT = 2;
+  }
+  message HalfSpaceParams {
+    HalfSpace half_space_first = 1;
+    HalfSpace half_space_second = 2;
+  }
+  oneof additional_params {
+    Alignment alignment = 5;
+    HalfSpaceParams half_space_params = 6;
+  }
+}
+
+message LengthConstraint {
+  uint32 entity = 1 [(nc_field_options).is_pointer = true];
+  double length = 2;
+}
+
+message DiameterConstraint {
+  uint32 entity = 1 [(nc_field_options).is_pointer = true];
+  double length = 2;
+}
+
+message RadiusConstraint {
+  uint32 entity = 1 [(nc_field_options).is_pointer = true];
+  double length = 2;
+}
+
+message AngleConstraint {
+  uint32 first = 1 [(nc_field_options).is_pointer = true];
+  uint32 second = 2 [(nc_field_options).is_pointer = true];
+  double angle = 3;
+}
+
+message HorizontalConstraint {
+  repeated uint32 entities = 1
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 1];
+}
+
+message VerticalConstraint {
+  repeated uint32 entities = 2
+      [(nc_field_options).is_pointer = true, (nc_field_options).at_least = 1];
+}
+
+message MidpointConstraint {
+  uint32 midpoint = 1 [(nc_field_options).is_pointer = true];
+  message Endpoints {
+    uint32 first = 1 [(nc_field_options).is_pointer = true];
+    uint32 second = 2 [(nc_field_options).is_pointer = true];
+  }
+  oneof additional_params {
+    Endpoints endpoints = 2;
+    uint32 entity = 3 [(nc_field_options).is_pointer = true];
+  }
+}
diff --git a/cadl/download_dataset.sh b/cadl/download_dataset.sh
new file mode 100644
index 0000000..b928125
--- /dev/null
+++ b/cadl/download_dataset.sh
@@ -0,0 +1,25 @@
+#!/bin/bash
+# Copyright 2021 Deepmind Technologies Limited.
+#
+# 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.
+
+set -e
+
+OUTPUT_DIR="data"
+BASE_URL="https://storage.googleapis.com/cadl/"
+
+mkdir -p ${OUTPUT_DIR}
+for file in train.tfrecord valid.tfrecord test.tfrecord
+do
+wget -O "${OUTPUT_DIR}/${file}" "${BASE_URL}${file}"
+done
diff --git a/cadl/entities.proto b/cadl/entities.proto
new file mode 100644
index 0000000..9450e66
--- /dev/null
+++ b/cadl/entities.proto
@@ -0,0 +1,85 @@
+// Copyright 2021 Deepmind Technologies Limited.
+//
+// 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.
+
+syntax = "proto3";
+
+package deepmind.cad.protos;
+
+import "google/protobuf/empty.proto";
+import "common.proto";
+
+message Vector {
+  double x = 1;
+  double y = 2;
+}
+
+message PointEntity {
+  bool is_construction = 1;
+  Vector point = 2;
+}
+
+message LineEntity {
+  bool is_construction = 1;
+  Vector start = 2;
+  Vector end = 3;
+}
+
+message CircleArcEntity {
+  bool is_construction = 1;
+  Vector center = 2;
+  double radius = 3;
+  message ArcParams {
+    Vector direction = 1;
+    bool is_clockwise = 2;
+    double start_angle = 3;
+    double end_angle = 4;
+  }
+  oneof additional_params {
+    google.protobuf.Empty circle_params = 4;
+    ArcParams arc_params = 5;
+  }
+}
+
+message CircleArcEntityV2 {
+  bool is_construction = 1;
+  Vector center = 2;
+  message CircleParams {
+    double radius = 1;
+  }
+  message ArcParams {
+    Vector start = 1;
+    Vector end = 2;
+    bool is_clockwise = 3;
+  }
+  oneof additional_params {
+    CircleParams circle_params = 3;
+    ArcParams arc_params = 4;
+  }
+}
+
+message InterpolatedSplineEntity {
+  bool is_construction = 1;
+  bool is_periodic = 2;
+  repeated Vector interpolation_points = 3 [(nc_field_options).at_least = 2];
+  Vector start_derivative = 4;
+  Vector end_derivative = 5;
+  message TrimmedParams {
+    double start_phi = 1;
+    double end_phi = 2;
+  }
+  oneof additional_params {
+    google.protobuf.Empty untrimmed_params = 6;
+    TrimmedParams trimmed_params = 7;
+  }
+}
diff --git a/cadl/example.proto b/cadl/example.proto
new file mode 100644
index 0000000..ac110d2
--- /dev/null
+++ b/cadl/example.proto
@@ -0,0 +1,63 @@
+// Copyright 2021 Deepmind Technologies Limited.
+//
+// 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.
+
+syntax = "proto3";
+
+package deepmind.cad.protos;
+
+import "constraints.proto";
+import "entities.proto";
+
+message Entity {
+  oneof kind {
+    PointEntity point_entity = 1;
+    LineEntity line_entity = 2;
+    CircleArcEntityV2 circle_arc_entity = 3;
+    InterpolatedSplineEntity interpolated_spline_entity = 4;
+  }
+}
+
+message Constraint {
+  oneof kind {
+    FixConstraint fix_constraint = 1;
+    CoincidentConstraint coincident_constraint = 2;
+    ConcentricConstraint concentric_constraint = 3;
+    EqualConstraint equal_constraint = 4;
+    ParallelConstraint parallel_constraint = 5;
+    TangentConstraint tangent_constraint = 6;
+    PerpendicularConstraint perpendicular_constraint = 7;
+    MirrorConstraint mirror_constraint = 8;
+    DistanceConstraint distance_constraint = 9;
+    LengthConstraint length_constraint = 10;
+    DiameterConstraint diameter_constraint = 11;
+    RadiusConstraint radius_constraint = 12;
+    AngleConstraint angle_constraint = 13;
+    HorizontalConstraint horizontal_constraint = 14;
+    VerticalConstraint vertical_constraint = 15;
+    MidpointConstraint midpoint_constraint = 16;
+  }
+}
+
+message EntitySequence {
+  repeated Entity entities = 1;
+}
+
+message ConstraintSequence {
+  repeated Constraint constraints = 1;
+}
+
+message Example {
+  EntitySequence entity_sequence = 1;
+  ConstraintSequence constraint_sequence = 2;
+}
diff --git a/cadl/media/sketch_data.gif b/cadl/media/sketch_data.gif
new file mode 100644
index 0000000..111f604
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