diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..f9e2281
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,13 @@
+[report]
+exclude_lines =
+    # if a line gets matched with this, we dont count it as missing in the coverage report
+    # keep default behaviour of coverage
+    pragma: no cover
+
+    # skip lines that raise a specific error (^\s matches beginning of line + any whitespace length)
+    ^\s*raise NotImplementedError
+    ^\s*raise AssertionError
+    ^\s*raise ValueError
+
+    # skip lines that are only "pass"
+    ^\s*pass\s*$
\ No newline at end of file
diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..0e4441d
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,11 @@
+# Ignore everthing to use this dockerignore as a whitelist
+*
+
+# Specifically add all files that should not be ignored
+!requirements.txt
+!setup.py
+!src
+!test
+!pytest.ini
+!.flake8
+!scripts
\ No newline at end of file
diff --git a/.flake8 b/.flake8
new file mode 100644
index 0000000..29ee453
--- /dev/null
+++ b/.flake8
@@ -0,0 +1,40 @@
+[flake8]
+ignore =
+    # C812: Missing trailing comma. Deactivated because of incompatibility with black.
+    C812,
+    # C815 missing trailing comma in Python 3.5+. Deactivated because of incompatibility with black.
+    C815
+    # E203: Space before :. Deactivated because of incompatibility with black, see https://github.com/ambv/black#slices.
+    E203,
+    # E402: Module level import not at top of file. We sometimes need this (e.g. mparams, dataflow).
+    E402,
+    # I100: Import statements are in the wrong order. Deactivated because we often need to import `future` at the beginning
+    #       for Python2/3 compatibility.
+    I100,
+    # I201: Missing newline between import groups. Same as I100.
+    I201,
+    # W503: Handling of breaking around binary operators. Necessary because of Flake8 update in
+    #       https://github.com/merantix/core/commit/dee61ff623b2cb08d6827afcea502edb9a8f76fb
+    W503,
+    # W605: Invalid escape sequence 'x'. Necessary because of Flake8 update in
+    #       https://github.com/merantix/core/commit/dee61ff623b2cb08d6827afcea502edb9a8f76fb
+    W605,
+    # Exceptions for the type hinting plugin, flake8-annotations
+    ANN002, # Missing type annotation for *args
+    ANN003, # Missing type annotation for **kwargs
+    ANN101, # Missing type annotation for self in method
+    ANN102, # Missing type annotation for cls in classmethod
+    ANN204, # Missing return type annotation for special method, e.g. init
+    # The following is for the docstring plugin, to make it less whiny. We are happy if we have docs on all functions
+    D100, # Missing docstring in public module
+    D101, # Missing docstring in public class
+    D104, # Missing docstring in public package
+    D202, # No blank lines allowed after function docstring
+    D205, # 1 blank line required between summary line and description
+    D212, # Multi-line docstring summary should start at the first line
+    D415 # First line should end with a period, question mark, or exclamation point
+
+max_line_length = 120
+import_order_style = appnexus
+application_package_names = devtool
+docstring-convention = google
\ No newline at end of file
diff --git a/.flake8_nb b/.flake8_nb
new file mode 100644
index 0000000..2d26d4c
--- /dev/null
+++ b/.flake8_nb
@@ -0,0 +1,42 @@
+[flake8_nb]
+ignore =
+    # C812: Missing trailing comma. Deactivated because of incompatibility with black.
+    C812,
+    # C815 missing trailing comma in Python 3.5+. Deactivated because of incompatibility with black.
+    C815
+    # E203: Space before :. Deactivated because of incompatibility with black, see https://github.com/ambv/black#slices.
+    E203,
+    # E402: Module level import not at top of file. We sometimes need this (e.g. mparams, dataflow).
+    E402,
+    # E501: Line too long. Some 'pip install' commands in the notebooks are just too long
+    E501
+    # I100: Import statements are in the wrong order. Deactivated because we often need to import `future` at the beginning
+    #       for Python2/3 compatibility.
+    I100,
+    # I201: Missing newline between import groups. Same as I100.
+    I201,
+    # W503: Handling of breaking around binary operators. Necessary because of Flake8 update in
+    #       https://github.com/merantix/core/commit/dee61ff623b2cb08d6827afcea502edb9a8f76fb
+    W503,
+    # W605: Invalid escape sequence 'x'. Necessary because of Flake8 update in
+    #       https://github.com/merantix/core/commit/dee61ff623b2cb08d6827afcea502edb9a8f76fb
+    W605,
+    # Exceptions for the type hinting plugin, flake8-annotations
+    ANN002, # Missing type annotation for *args
+    ANN003, # Missing type annotation for **kwargs
+    ANN101, # Missing type annotation for self in method
+    ANN102, # Missing type annotation for cls in classmethod
+    ANN204, # Missing return type annotation for special method, e.g. init
+    # The following is for the docstring plugin, to make it less whiny. We are happy if we have docs on all functions
+    D100, # Missing docstring in public module
+    D101, # Missing docstring in public class
+    D104, # Missing docstring in public package
+    D202, # No blank lines allowed after function docstring
+    D205, # 1 blank line required between summary line and description
+    D212, # Multi-line docstring summary should start at the first line
+    D415, # First line should end with a period, question mark, or exclamation point
+
+max_line_length = 120
+import_order_style = appnexus
+application_package_names = devtool
+docstring-convention = google
\ No newline at end of file
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..ec1865d
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+*.ipynb filter=nbstripout
+*.ipynb diff=ipynb
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 06e110b..6690319 100644
--- a/.gitignore
+++ b/.gitignore
@@ -168,3 +168,6 @@ npm-debug.log
 
 # Hydra
 outputs/
+
+
+test/data
\ No newline at end of file
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..e2bb1a5
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,69 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+# See
+# https://medium.com/staqu-dev-logs/keeping-python-code-clean-with-pre-commit-hooks-black-flake8-and-isort-cac8b01e0ea1
+default_language_version:
+  python: python3.8
+exclude: (?x)(^docs/_build)
+repos:
+- repo: https://github.com/ambv/black
+  rev: 21.9b0
+  hooks:
+  - id: black # Format Python code
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
+- repo: https://github.com/pre-commit/mirrors-autopep8
+  rev: v1.5.4  # Use the sha / tag you want to point at
+  hooks:
+  - id: autopep8
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
+- repo: https://gitlab.com/pycqa/flake8
+  rev: 3.8.4
+  hooks:
+  - id: flake8 # Apply flake 8 python file linter
+    additional_dependencies:
+    - keyrings.google-artifactregistry-auth
+    - "--index-url=https://pypi.org/simple/"
+    - "flake8-annotations==2.5.0"
+    - "flake8-bugbear==21.9.2"
+    - "flake8-docstrings==1.5.0"
+- repo: https://github.com/adrienverge/yamllint
+  rev: v1.26.1
+  hooks:
+  - id: yamllint # Check YAML Files
+    args: ['-d', "{extends: relaxed, rules: {line-length: {max: 120 }}}"]
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
+- repo: local
+  hooks: # Not nice
+  - id: terraform-version
+    name: Check if terraform v1.0.4 is installed correctly. If this fails, check your version with `terraform --version`
+    language: system
+    entry: bash -c "exit $(terraform --version | sed -n 1p | sed 's/Terraform v//;q' | grep -qE '^\s*1.0.4\s*$')"
+    files: (\.tf|\.tfvars)$  # Only run if there actually are tf files to lint!
+    exclude: \.terraform\/.*$
+    pass_filenames: false
+    require_serial: true
+- repo: https://github.com/antonbabenko/pre-commit-terraform
+  rev: v1.60.0
+  hooks:
+  - id: terraform_fmt
+    args:
+    - "--args=-diff"
+- repo: https://github.com/sqlfluff/sqlfluff
+  rev: 0.4.0  # Oldest version with pre-commit hooks!
+  hooks:
+  - id: sqlfluff-lint
+    args: ["--dialect", "ansi"]
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
+  - id: sqlfluff-fix
+    args: ["--dialect", "ansi"]
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
+- repo: https://github.com/psf/black
+  rev: 21.9b0
+  hooks:
+  - id: black-jupyter # Format jupyter notebooks
+    additional_dependencies: [".[jupyter]", "--index-url=https://pypi.org/simple/"]
+- repo: https://github.com/s-weigand/flake8-nb
+  rev: v0.4.0
+  hooks:
+  - id: flake8-nb # Lint jupyter notebooks
+    additional_dependencies: ["--index-url=https://pypi.org/simple/"]
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..59fde39
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
+                                 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 2022 Merantix Labs GmbH
+
+   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.
\ No newline at end of file
diff --git a/infrastructure/docker/Dockerfile b/infrastructure/docker/Dockerfile
new file mode 100644
index 0000000..dc7af8b
--- /dev/null
+++ b/infrastructure/docker/Dockerfile
@@ -0,0 +1,36 @@
+FROM python:3.8.9-slim
+
+RUN apt-get update && \
+    apt-get -y install git findutils build-essential unzip wget && \
+    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+ADD . .
+
+RUN pip3 install keyrings.google-artifactregistry-auth==0.0.3 --index-url=https://pypi.org/simple/
+RUN pip3 install --upgrade pip && \
+    pip3 install --require-hashes -r requirements.txt --no-deps --disable-pip-version-check && \
+    pip3 cache purge
+
+# for testing to work, the base image has to have spark<=3.1, >=3.0
+# spark>=3.0 is required by python3.8
+# spark <=3.1 is required by pydeequ (deequ)
+
+# add java
+COPY --from=adoptopenjdk/openjdk8 opt/java opt/java
+ENV JAVA_HOME=/opt/java/openjdk
+ENV PATH=$PATH:$JAVA_HOME/bin
+
+# add spark
+ADD https://archive.apache.org/dist/spark/spark-3.2.0/spark-3.2.0-bin-hadoop3.2.tgz .
+RUN rm -rf /opt/spark && \
+    tar -xzf spark-3.2.0-bin-hadoop3.2.tgz -C /opt && \
+    mv /opt/spark-3.2.0-bin-hadoop3.2/ /opt/spark
+ENV SPARK_HOME="/opt/spark"
+
+# add hadoop
+ADD https://archive.apache.org/dist/hadoop/common/hadoop-3.2.0/hadoop-3.2.0.tar.gz .
+RUN tar xf hadoop-3.2.0.tar.gz && mv hadoop-3.2.0 /opt/hadoop && rm hadoop-3.2.0.tar.gz
+ENV HADOOP_HOME="/opt/hadoop"
+
+# add shaded gcs connector
+ADD https://repo1.maven.org/maven2/com/google/cloud/bigdataoss/gcs-connector/hadoop3-2.2.2/gcs-connector-hadoop3-2.2.2-shaded.jar /opt/spark/jars/gcs-connector-hadoop3-latest.jar
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..3f851f4
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,9 @@
+[tool.autopep8]
+max_line_length = 120
+ignore="E265,E501,E203"
+in-place = true
+recursive = true
+
+[tool.black]
+line-length = 120
+include = '\.pyi?$'
\ No newline at end of file
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..54b7e5c
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,7 @@
+[pytest]
+testpaths =
+    test
+    squirrel_datasets/integration_test
+addopts = -p no:warnings -v --cov=squirrel_datasets --cov-config=.coveragerc
+norecursedirs = '.*', 'build', 'dist', 'CVS', '_darcs', '{arch}', '*.egg'
+marks = serial: Tests that should be run sequentially without any tests running in parallel.
\ No newline at end of file
diff --git a/requirements.dev.in b/requirements.dev.in
index 112e5d8..e51c3fe 100644
--- a/requirements.dev.in
+++ b/requirements.dev.in
@@ -1,4 +1,5 @@
 sphinx-rtd-theme
+keyrings.google-artifactregistry-auth==0.0.3
 twine
 wheel
 pytest>=5.3.5
@@ -6,8 +7,12 @@ pytest-timeout
 pytest-cov
 pytest-xdist
 Sphinx<4.0.0
+sphinx-mx-theme>=0.1.4,<1.0.0
 sphinx_versions
+myst_parser # For importing md into rst files.
 pyspark>=3.2.0
 flaky # for retry flaky tests
 nbmake
 jupyter
+networkx
+pre-commit==2.16.0
\ No newline at end of file
diff --git a/requirements.hub.in b/requirements.hub.in
new file mode 100644
index 0000000..f4a5657
--- /dev/null
+++ b/requirements.hub.in
@@ -0,0 +1 @@
+hub
\ No newline at end of file
diff --git a/requirements.preprocessing.in b/requirements.preprocessing.in
new file mode 100644
index 0000000..cf9b401
--- /dev/null
+++ b/requirements.preprocessing.in
@@ -0,0 +1,2 @@
+pyspark==3.2.0
+hydra-core>=1.1.0
\ No newline at end of file
diff --git a/requirements.torchvision.in b/requirements.torchvision.in
new file mode 100644
index 0000000..e5be9d8
--- /dev/null
+++ b/requirements.torchvision.in
@@ -0,0 +1,2 @@
+torchvision
+scipy # required by torch dataset "caltech"
\ No newline at end of file