From 8313ee3e25ca9bda407bbaccea7d6b6bb258f5c1 Mon Sep 17 00:00:00 2001
From: Yaroslav Halchenko <debian@onerussian.com>
Date: Fri, 30 Jan 2026 10:49:33 -0500
Subject: [PATCH] Copy YODA talk for the future webinar slides

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+<!doctype html>
+
+<html>
+	<head>
+		<meta charset="utf-8">
+		<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
+
+		<!-- Edit me start! -->
+		<title>Pragmatic YODA: overview of YODA principles and their wild life encounters</title>
+		<meta name="description" content="Slides for the https://distribits.live/ 2025">
+		<meta name="author" content=" Yaroslav O. Halchenko ">
+		<!-- Edit me end! -->
+
+		<link rel="stylesheet" href="css/custom.css">
+
+		<link rel="stylesheet" href="reveal.js/dist/reset.css">
+		<link rel="stylesheet" href="reveal.js/dist/reveal.css">
+		<link rel="stylesheet" href="reveal.js/dist/theme/beige.css">
+
+		<!-- Theme used for syntax highlighted code -->
+		<link rel="stylesheet" href="reveal.js/plugin/highlight/monokai.css">
+
+	</head>
+	<body>
+		<div class="reveal">
+			<div class="slides">
+
+
+<!-- Start of slides -->
+<section>
+  <section>
+	  <a href="http://centerforopenneuroscience.org/"><img data-src="pics/con-ccn-dartmouth-letterhead.svg"></a>
+	  <h2>Pragmatic YODA: overview of YODA principles<br/> and their wild life encounters</h2>
+ 
+    <div style="margin-top:1em;text-align:center">
+    <table style="border: none;">
+    <tr>
+	<td>
+      Yaroslav O. Halchenko<br>
+	  <small><a href="https://twitter.com/yarikoptic" target="_blank"><img data-src="pics/twitter.png" style="height:30px;margin:0px" />@yarikoptic</a></small>
+	  <small><a href="https://fosstodon.org/@yarikoptic" target="_blank"><img data-src="pics/mastodon-icon.svg" style="height:30px;margin:0px;margin-right:0.1em" />@yarikoptic@fosstodon.org</a></small>
+    </td>
+	<td></td>
+    </tr>
+    <tr>
+      <td>
+		<small><br><a href="http://centerforopenneuroscience.org/" target="_blank">Center for Open Neuroscience</a>
+          <br><a href="https://pbs.dartmouth.edu/" target="_blank">Department of Psychological and Brain Sciences</a>
+          <br><a href="https://www.dartmouth.edu/ccn/" target="_blank">Center for Cognitive Neuroscience</a><br>
+		  <a href="http://www.dartmouth.edu" target="_blank">Dartmouth College<br>
+		  New Hampshire, USA</a></small>
+
+		  <img style="width:200px; margin: 0px" data-src="pics/2025-distribits-YODA-qrcode.png"/>
+      </td>
+	  <td>
+	  </td>
+    </tr>
+    </table>
+    </div>
+<!--
+  <p style="z-index: 100;position: fixed;background-color:#ede6d5;font-size:35px;box-shadow: 10px 10px 8px #888888;margin-top:0px;margin-bottom:100px;margin-left:1000px">
+        <img src="pics/QRcode_hhu.png" height="200">
+    </p>
+<br><br><small>
+    Slides: <a href="https://doi.org/10.5281/zenodo.6346849" target="_blank">
+    DOI 10.5281/zenodo.6346849</a> (Scan the QR code)
+    <br>
+</small>
+-->
+<small>
+  Live slides/<a href="https://datasets.datalad.org/centerforopenneuroscience/talks/.git">Sources</a>:
+  <a href="https://datasets.datalad.org/centerforopenneuroscience/talks/2025-distribits-YODA.html">https://datasets.datalad.org/centerforopenneuroscience/talks/2025-distribits-YODA.html</a><br/>
+  YouTube: <a href="https://www.youtube.com/watch?v=EuKVapscUQ4">https://www.youtube.com/watch?v=EuKVapscUQ4</a>.
+<br>
+<small>
+ <!--	 <a href="http://pymvpa.org" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/pymvpa_icon.png"/></a> -->
+     <a href="http://datalad.org" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/datalad_D.svg"/></a>
+	 <a href="http://neuro.debian.net" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/neurodebian.png"/></a>
+	 <a href="http://repronim.org" target="_blank"> <img  style="height:120px;margin:20px"  data-src="pics/repronim-logo-vertical.svg"/></a>
+  <a href="https://open-brain-consent.readthedocs.io" target="_blank"> <img  style="height:120px;margin:20px"  data-src="pics/OBC_LogoCheck.svg"/></a>
+<!--	 <a href="https://github.com/myyoda/myyoda" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/yoda.svg"/></a> -->
+	 <a href="https://dandiarchive.org" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/dandi-logo-square.svg"/></a>
+  	 <a href="https://bids.neuroimaging.io/" target="_blank"> <img  style="height:120px;margin:20px" data-src="pics/BIDS_Logo.png"/></a>
+	 <a href="https://standforukraine.com/" target="_blank"> <img  style="height:120px;margin:20px"  data-src="pics/Ukrainian_Blue-Yellow_ribbon.svg"/></a>
+
+</small>
+
+</small>
+  </section>
+</section>
+
+<section data-transition="slide">
+
+<section>
+  <h2>Acknowledgements</h2>
+	<img style="height:150px;margin-right:50px" data-src="pics/borrowed/nih.png" />
+	<img style="height:150px;margin-right:50px" data-src="pics/borrowed/nsf1.jpg" />
+	<img style="height:120px;margin-right:50px;margin-bottom:30px" data-src="pics/datalad_D.svg" />
+	<img style="height:150px;margin-right:50px" data-src="pics/con_logo_square.png" />
+
+</section>
+
+<section>
+  <h2>A YODA principle a day keeps gray hair rate at bay</h2>
+</section>
+</section>
+
+<!-- Overall YODA -->
+<section><section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n"><textarea data-template>
+###
+
+![YODA principles](pics/yoda-principles-reordered.png)
+
+from https://github.com/myyoda/poster/ <br/>
+<small>
+by *Michael Hanke, Kyle A. Meyer, Matteo Visconti di Oleggio Castello, Benjamin Poldrack & Yaroslav O. Halchenko*. 2018 OHBM
+</small>
+</textarea></section></section>
+
+<!-- Principle 1: VCS -->
+
+<section>
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n">
+<textarea data-template>
+
+### YODA Principle 1: Version control everything!
+
+![YODA Principle 1: Version control everything!](pics/principle-vcs.png)
+</textarea>
+</section>
+
+<section>
+  <h2>Why version control?</h2>
+  <table style="width:70%;">
+    <tr>
+      <td style="width:40%; vertical-align:top;">
+        <ul>
+		  <li class="fade-in">collaborate</li>
+		  <li class="fade-in">keep things synchronized</li>
+          <li class="fade-in">keep track of changes</li>
+		  <li class="fade-in">use as a backup</li>
+		  <li class="fade-in">search (grep)</li>
+		  <li class="fade-in">...</li>
+          <!-- Add more list items here -->
+        </ul>
+      </td>
+      <td style="width:60%; text-align:center;">
+        <img src="pics/borrowed/phdcomics-notfinal.png" style="box-shadow: 10px 10px 8px #888888; height:700px;" height="700">
+		<small>Borrowed from <a href="https://phdcomics.com/comics/archive.php?comicid=1531">PhD Comics 1531</a>.</small>
+      </td>
+    </tr>
+  </table>
+  <aside class="notes">
+    <li>Not only manuscripts, but also data!</li>
+  </aside>
+</section>
+
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n">
+<textarea data-template>
+
+### VCS allows to experiment
+
+![versioncontrol](pics/borrowed/versioncontrol.svg)
+
+- Planned - do in a branch and discard or merge
+  - `git branch` and `git checkout` -- create alternative timelines
+  - `git worktree` -- create alternative trees
+
+----
+
+### VCS allows to experiment
+
+- Unplanned (well, somewhat)
+  - you introduce changes or just run `some-command(s)`
+  - `git reset --hard && git clean -dfx` -- no evil was done
+  - `git reset --hard HEAD^` -- forget we did it
+  - `git reset --hard COMMITISH` -- get-the-hell-out-of-here
+
+----
+
+![yoda-say](pics/yoda-say-track.png)
+
+#### Tracking -- we know how...
+#### If any change is “computed”, it is easy to record more provenance automatically!
+
+----
+
+### YODA skill: [datalad run](https://docs.datalad.org/en/stable/generated/man/datalad-run.html)
+
+#### Handbook example on "Brain Extraction"
+
+
+```shell
+$ datalad run -m "run brain extract workflow" \
+ --input "inputs/ds*/sub-01/anat/sub-01_T1w.nii.gz" \
+ --output "sub-*/anat" \
+ bash -e code/brain_extraction.sh inputs/ds*/sub-01/anat/sub-01_T1w.nii.gz
+[INFO] Making sure inputs are available (this may take some time) 
+get(ok): inputs/ds000001/sub-01/anat/sub-01_T1w.nii.gz (file) [from web...]
+get(ok): inputs/ds000002/sub-01/anat/sub-01_T1w.nii.gz (file) [from web...]
+[INFO] == Command start (output follows) ===== 
+action summary:
+  get (notneeded: 4)
+Processing inputs/ds000001/sub-01/anat/sub-01_T1w.nii.gz
+Processing inputs/ds000002/sub-01/anat/sub-01_T1w.nii.gz
+[INFO] == Command exit (modification check follows) ===== 
+run(ok): /home/me/usecases/repro/demo (dataset) [bash -e code/brain_extraction.sh inputs/...]
+add(ok): sub-001/anat.nii.gz (file)
+add(ok): sub-001/anat_mask.nii.gz (file)
+add(ok): sub-002/anat.nii.gz (file)
+add(ok): sub-002/anat_mask.nii.gz (file)
+save(ok): . (dataset)
+```
+
+<small>
+
+  From [DataLad Handbook: A basic automatically and computationally reproducible neuroimaging analysis](https://handbook.datalad.org/en/latest/usecases/reproducible_neuroimaging_analysis_simple.html)
+</small>
+
+----
+
+### Result: automated record
+
+```shell
+$ git show --stat
+commit 1223bc4bead3c7e6be15b78546c894c6465dd7a4
+Author: Elena Piscopia <elena@example.net>
+Date:   Wed Apr 13 11:37:58 2022 +0200
+
+    [DATALAD RUNCMD] run brain extract workflow
+
+    === Do not change lines below ===
+    {
+     "chain": [],
+     "cmd": "bash -e code/brain_extraction.sh inputs/ds000001/sub-01/anat/sub-01_T1w.nii.gz inputs/ds000002/sub-01/anat/sub-01_T1w.nii.gz",
+     "dsid": "b656ac80-973c-45ef-887e-1b8d6f6a51dd",
+     "exit": 0,
+     "extra_inputs": [],
+     "inputs": [
+      "inputs/ds*/sub-01/anat/sub-01_T1w.nii.gz"
+     ],
+     "outputs": [
+      "sub-*/anat"
+     ],
+     "pwd": "."
+    }
+    ^^^ Do not change lines above ^^^
+
+ sub-001/anat.nii.gz      | 1 +
+ sub-001/anat_mask.nii.gz | 1 +
+ sub-002/anat.nii.gz      | 1 +
+ sub-002/anat_mask.nii.gz | 1 +
+ 4 files changed, 4 insertions(+)
+```
+
+- know *how* you got the change done: **no guessing!**
+- from a clean git state to a clean git state: **no surprises!**
+
+----
+
+### How you got here know you do!
+
+<img  style="height:450px;margin:20px" data-src="pics/yoda.svg"/>
+
+----
+
+### YODA skill: [datalad rerun](https://docs.datalad.org/en/stable/generated/man/datalad-rerun.html)!
+
+```shell
+$ datalad rerun
+[INFO] run commit 1223bc4; (run brain extract...)
+[INFO] Making sure inputs are available (this may take some time) 
+unlock(ok): sub-001/anat.nii.gz (file)
+unlock(ok): sub-001/anat_mask.nii.gz (file)
+unlock(ok): sub-002/anat.nii.gz (file)
+unlock(ok): sub-002/anat_mask.nii.gz (file)
+[INFO] == Command start (output follows) ===== 
+action summary:
+  get (notneeded: 4)
+Processing inputs/ds000001/sub-01/anat/sub-01_T1w.nii.gz
+Processing inputs/ds000002/sub-01/anat/sub-01_T1w.nii.gz
+[INFO] == Command exit (modification check follows) ===== 
+run(ok): /home/me/usecases/repro/demo (dataset) [bash -e code/brain_extraction.sh inputs/...]
+add(ok): sub-001/anat.nii.gz (file)
+add(ok): sub-001/anat_mask.nii.gz (file)
+add(ok): sub-002/anat.nii.gz (file)
+add(ok): sub-002/anat_mask.nii.gz (file)
+action summary:
+  add (ok: 4)
+  get (notneeded: 4)
+  run (ok: 1)
+  save (notneeded: 3)
+  unlock (ok: 4)
+```
+
+- And redo able you are: **magic!**
+
+<small>
+ 
+  From [DataLad Handbook: A basic automatically and computationally reproducible neuroimaging analysis](https://handbook.datalad.org/en/latest/usecases/reproducible_neuroimaging_analysis_simple.html)
+</small>
+
+----
+
+### [datalad rerun](https://docs.datalad.org/en/stable/generated/man/datalad-rerun.html) - "Functional cherry-pick"
+
+![rerun](pics/rerun.svg)<!-- .element width="80%" -->
+
+----
+
+### DataLad runs in the wild: [datalad-usage-registry](http://github.com/datalad/datalad-usage-dashboard)
+
+[![Distribits 2024: DataLad-Registry](pics/distribits-2024-datalad-registry.png)](https://www.youtube.com/watch?v=_McJ1BtLsiQ)
+
+<small>
+
+[distribits 2024](https://distribits.live). Isaac To, Yaroslav O. Halchenko. "DataLad-Registry, Bringing Benefits of Centrality to DataLad":
+
+- Video: https://www.youtube.com/watch?v=_McJ1BtLsiQ
+
+----
+
+### Side-topic: update on "git-annex/DataLad stats"
+
+[![DataLad registry stats](pics/datalad-registry-stats-20251021.png)](https://registry.datalad.org/overview/)
+
+----
+
+### DataLad runs in the wild: [datalad-usage-registry](http://github.com/datalad/datalad-usage-dashboard)
+
+```shell
+$ git remote -v
+origin	https://github.com/datalad/datalad-usage-dashboard (fetch)
+
+# Among total number of records for github
+$ jq '[.github[]] | length' datalad-repos.json
+11011
+
+# we found DATALAD RUNCMD in
+$ jq '[.github[] | select(.run == true)] | length' datalad-repos.json
+1578
+
+# which is
+$ python -c 'print("%.2f%%" % (100*1578/11011))'
+14.33%
+```
+
+- and if we know the command on how to `get` the file ...
+
+----
+
+### YODA wanted git-annex complete not
+
+[![Distribits 2024: "git annex is complete, right?"](pics/distribits-2024-git-annex-complete.png)](https://www.youtube.com/watch?v=pp8IeGXpRRI)
+
+<small>
+
+[distribits 2024](https://distribits.live). Joey Hess. "git annex is complete, right?":
+
+- Video: https://www.youtube.com/watch?v=pp8IeGXpRRI
+
+----
+
+### now we can use [git-annex addcomputed](https://git-annex.branchable.com/git-annex-addcomputed/)
+
+![addcomputed-1](pics/borrowed/git-annex-addcomputed-1.png)
+![addcomputed-2](pics/borrowed/git-annex-addcomputed-2.png)
+
+----
+
+## A missing piece: https://github.com/con/duct
+
+![](pics/webshot-con-duct.png)
+
+----
+
+## duct as a runner within datalad containers-run
+
+<div style="position: relative; width: 100%; height: 90vh;">
+
+<img src="pics/screenshot-duct-diff.png" class="" width="80%" style="position: absolute; top: 3%; left: 0%" />
+<!-- <img src="pics/screenshot-duct-1.png" class="fragment fade-in" --
+  -- width="100%" style="position: absolute; top: 0%; left: 0%" /> -->
+<img src="pics/screenshot-duct-2.png" class="fragment fade-in" width="100%" style="position: absolute; top: 25%; left: 0%" />
+<img src="pics/screenshot-duct-3.png" class="fragment fade-in" width="100%" style="position: absolute; top: 15%; left: 10%" />
+<img src="pics/screenshot-duct-4.png" class="fragment fade-in" width="100%" style="position: absolute; top: 60%; left: 10%" />
+
+- or now just set env var REPRONIM_USE_DUCT=1 <!-- .element: class="fragment" data-fragment-index="1" -->
+
+</div>
+
+----
+
+### [con-duct plot]() your traces
+
+[![](pics/duct-mriqc-cerebra.png)<!-- .element width="60%" -->](https://github.com/con/duct-gallery/?tab=readme-ov-file#mriqc-processing-on-a-single-subjectsession)
+
+- Use and contribute!
+
+----
+
+### Principle 1: Version Control Everything
+
+Version control of all digital components (data, code, etc)
+allows also
+
+- to experiment
+- to embed re-actionable execution HOWTO into commit messages
+- to record execution extra artifacts and profiling results
+- allow for "functional patching"
+
+----
+
+## and **why** are we doing that?
+
+----
+
+### for a life-pain balance and for that to avoid
+
+![](pics/depends-on-untracked-file.png)
+
+<small>
+
+  Courtesy of [@asmacdo](https://github.com/asmacdo)
+
+</small>
+
+----
+
+### Learn control you must!
+
+<img style="height:450px;margin:20px" data-src="pics/yoda.svg"/>
+
+</textarea></section></section>
+
+<!-- Principle 2:  -->
+
+<section>
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n">
+<textarea data-template>
+### YODA Principle 2: Portable compute environments
+
+![YODA Principle 2](pics/principle-computeenv.png)
+
+----
+
+### Sharing software environments, obstacles
+
+- Software can be difficult or impossible to install
+- Especially harder on shared systems (e.g. HPC)
+- External software origin resources can change or vanish
+  - e.g. only latest versions could be provided **now**
+- Older builds might not be installable on new base environments
+- Different software versions/operating systems can produce different results:
+  [Glatard et al., doi.org/10.3389/fninf.2015.00012](https://doi.org/10.3389/fninf.2015.00012)
+
+----
+
+### A solution: Software containers
+
+- Software containers encapsulate a software environment.
+- Containers can isolate it from a surrounding operating system and expose only requested resources
+  - bound path names
+  - network
+  - GPU
+
+----
+
+### Container families
+
+- [Docker](http://docker.io) and [Podman](https://podman.io)
+  - Industry/end-user oriented
+  - [Open Container Initiative (OCI)](https://github.com/opencontainers/image-spec) specification. Layers
+  - Hubs: https://hub.docker.com, http://quay.io, https://ghcr.io, ...
+- [Singularity](https://github.com/sylabs/singularity) and [Apptainer](https://apptainer.org/)
+  - HPC and academic user oriented
+  - [Singularity Image File (SIF)](https://github.com/sylabs/sif) single file specification.
+  - Can import from OCI hubs, folders.
+  - https://singularity-hub.org (aka `shub://`) archive is maintained as [datasets.datalad.org/shub](https://datasets.datalad.org/?dir=/shub) to assist reproducibility
+
+----
+
+### [datalad-container](https://docs.datalad.org/projects/container/en/latest/) extension
+
+![](pics/webshot-datalad-container.png)
+
+- `pip/conda/apt-get install datalad-container`
+- For DataLad software containers are
+  - "just another file(s)"
+  - `.datalad/config` entry for how to execute
+
+----
+
+### [///repronim/containers](https://github.com/repronim/containers) collection
+
+![](pics/webshot-repronim-containers.png)
+
+- ready to use Singularity containers of popular neuroimaging containers
+- (local) "backup" of containers (in case removed from a Hub)
+- WiP to accompany with OCI images
+
+----
+
+### [datalad containers-run](https://docs.datalad.org/projects/container/en/stable/generated/man/datalad-containers-run.html#datalad-containers-run) it now!
+
+![](pics/containers-run.svg)
+
+<small>
+
+  More of hands-on explanation at e.g. ["Concepts & principles for reproducible science" course](https://datasets.datalad.org/datalad/datalad-course/html/uke_reproducibility.html)
+
+</small>
+
+----
+
+### result: clean record allowing re-execution
+
+![](pics/webshot-cerebra-mriqc.png)
+
+----
+
+### Principle 2: Portable compute environments
+
+(re)use software containers contained under<br/>
+your VCS to guarantee their
+
+- exact version
+- availability
+- accessibility
+
+<small>
+
+N.B. Talk to Alex Waite about their work on guaranteeing reproducibility and network encapsulation of containers.
+
+</small>
+
+----
+
+### Depend on where you run you should not!
+
+<img  style="height:450px;margin:20px" data-src="pics/yoda.svg"/>
+
+</textarea>
+</section>
+</section>
+
+
+<!-- Principle 3:  -->
+
+<section>
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n">
+<textarea data-template>
+
+### YODA Principle 3: Modular composition
+
+![YODA Principle 3](pics/principle-structure.png)
+
+----
+
+### We already deal with many "modules"
+
+- files
+- directories
+- software (distribution) packages
+- containers
+- virtual machines
+- ...
+
+
+#### <br/>They all establish grouping of other modules <br/> through a transformation towards their target usage mechanism.<!-- .element: class="fragment" data-fragment-index="1" -->
+
+----
+
+### We already deal with "global" layouts
+
+#### defined "globally" while relying on "packages" to adhere to the specifications.
+
+- Operating Systems layouts, e.g.
+  - [Filesystem Hierarchy Standard (FHS)](https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard)
+- [XDG (Cross-Desktop Group)](https://specifications.freedesktop.org/basedir-spec/latest/)
+
+<small>
+
+  N.B. YODA skill: Use Joey's [etckeeper](https://etckeeper.branchable.com) to keep your `/etc` under git
+
+</small>
+
+----
+
+### We already have "project" layouts
+
+#### defined locally per project
+
+- Programming language/platform specific
+  - e.g. think of a typical Python project
+- Typically not nested (unless "vendoring")
+
+
+----
+### YODA's Layout (circa 2018)
+
+#### Suggested layout for research projects
+
+![YODA layout](pics/yoda-layout.png)
+
+----
+
+### Yours can be different
+
+#### in neuro* we have decided to agree on [BIDS](https://bids-specification.readthedocs.io/)
+
+<div style="position: relative; width: 100%; height: 90vh;">
+
+<img src="pics/bids-nipoppy.png" class="" width="80%" style="position: absolute; top: 3%; left: 0%" />
+<img src="pics/bids-princeton.png" class="fragment fade-in" width="80%" style="position: absolute; top: 8%; left: 5%" />
+<img src="pics/bids-yoda.png" class="fragment fade-in" width="80%" style="position: absolute; top: 13%; left: 10%" />
+
+</div>
+
+----
+## Why [git submodules](https://git-scm.com/book/en/v2/Git-Tools-Submodules)
+
+- Establish reusable modules at directory boundaries
+- Native git mechanism: just a hexsha of a commit (not just a tree)
+- Allow for association with "origin" URL (changeable/flexible)
+- Allow for association of arbitrary other extra metadata
+- **Can be _installed_/_uninstalled_ as needed**
+
+----
+## When submodule/subdataset
+
+- Can have its "best" use/life of its own
+  - most likely to be used without other components
+  - target audience is different
+  - public vs. private (partially also via git-annex)
+  - domain specific vs. domain general
+
+- 1-to-many relationship
+  - single "factual" raw data vs. possibly multiple choices of (pre-)processing
+  - multiple source data sources vs single composite dataset
+
+- Size impacts I/O and logistics
+  - Git can struggle with 1M+ files
+  - filesystems (licensing) can struggle with large numbers of inodes
+     - see old but potentially still relevant <br/>
+       [_A git-annex-centric benchmark of file systems_, Halchenko, 2015](https://www.datalad.org/test_fs_analysis.html)
+  - More infos: [Go Big or Go Home chapter](http://handbook.datalad.org/en/latest/beyond_basics/basics-scaling.html)
+
+----
+
+### Proof of scalability: https://datasets.datalad.org/.git
+
+[![d.d.o](pics/datasets.datalad.org-20251021.png)](https://datasets.datalad.org/)
+
+- over 8,000 submodules
+- up to 6 levels deep
+- **those are incomplete stats**
+
+----
+
+### YODA: all the way down
+
+![](pics/yoda-all-the-way-down.png) <!-- .element width="40%" -->
+
+<small>
+
+  Courtesy of some AI and [@asmacdo](https://github.com/asmacdo)
+
+</small>
+
+----
+
+### YODA: from raw data to paper
+
+<!-- .slide: data-transition="fade" -->
+
+![ReproNim/containers workflow](pics/yoda-hierarchy-with-containers.png)
+
+----
+<!-- ### YODA with [ReproNim/containers](https://github.com/ReproNim/containers/#a-typical-workflow) -->
+
+<!-- .slide: data-transition="fade" -->
+
+![ReproNim/containers workflow](pics/repronim-containers-workflow.png)
+
+----
+
+![ReproNim/containers workflow show](pics/repronim-containers-show.png)
+
+----
+
+### Alternative to [datalad run](https://docs.datalad.org/en/stable/generated/man/datalad-run.html): [ReproMan](https://github.com/ReproNim/reproman)
+
+[![Distribits 2024: Joe on ReproMan](pics/distribits-reproman.png)](https://www.youtube.com/watch?v=P0SOGt3xWmw)
+
+<small>
+
+[distribits 2024](https://distribits.live). Joe Wexler: fMRI Pipelines on HPC with DataLad and ReproMan
+
+- Video: https://www.youtube.com/watch?v=P0SOGt3xWmw
+
+</small>
+
+</textarea>
+
+
+<!-- forgot that iframes to github do not work!
+----
+
+### Welcome the ultimate YODA style OpenNeuroDerivatives from CP5* OpenNeuro
+
+	<iframe src="https://github.com/OpenNeuroDerivatives/"
+    style="width:100%; height:600px;"></iframe>
+-->
+
+</section>
+
+<section data-transition="None">
+  <h3>
+	YODA style OpenNeuro Derivatives from OpenNeuro
+  </h3>
+  <small>
+<center><p>Explore/obtain yourself from <a href="https://github.com/OpenNeuroDerivatives">https://github.com/OpenNeuroDerivatives</a></p></center>
+  </small>
+
+	<div style="position: relative; width: 100%; height: 80vh;">
+    <img src="pics/webshot-onderivs-listing.png" class="" width="80%" style="position: absolute; top: 0%; left: 0%" />
+    <img src="pics/webshot-onderivs-gitmodules.png" class="fragment fade-in" width="80%"  style="position: absolute; top: 5%; left: 5%"  />
+    <img src="pics/webshot-onderivs-repromanfolder.png" class="fragment fade-in" width="80%"  style="position: absolute; top: 10%; left: 10%"  />
+    <img src="pics/webshot-onderivs-commandarray.png" class="fragment fade-in" width="80%"  style="position: absolute; top: 15%; left: 15%"  />
+    <img src="pics/webshot-onderivs-stdout.png" class="fragment fade-in" width="80%"  style="position: absolute; top: 20%; left: 20%"  />
+
+	</div>
+  </section>
+
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n">
+<textarea data-template>
+
+## What is a common principle followed in all of those setups?
+
+----
+
+![](pics/yoda-do-not-look-up.png)<!-- .element width="60%" -->
+
+----
+
+## Must rely only on what is reachable down the hierarchy **within** current module!
+
+### Must produce (mostly) its own content
+
+----
+
+# But why?
+
+----
+
+## ... to avoid
+
+![](pics/depends-on-untracked-file.png)
+
+----
+
+### ... do not look up ...
+
+<!-- .slide: data-transition="fade" -->
+
+![ReproNim/containers workflow](pics/yoda-hierarchy-with-containers.png)
+
+----
+
+# Corollaries
+
+- all related content could be version controlled
+- containers:
+  - need to bind mount only (elements of) current folder
+  - can map entire $PWD as $PWD inside
+- no full paths specification in CLI or hard-coding in scripts
+- the entire "module" becomes portable
+
+</textarea></section>
+
+</section>
+
+<!-- Summary section -->
+
+<section data-markdown  data-separator="^\n----\n" data-vertical="^\n---\n"><textarea data-template>
+
+## Take Home Messages
+
+----
+
+### More on YODA via DataLad
+
+![DataLad Handbook YODA](pics/datalad-handbook-yoda.png)
+
+http://handbook.datalad.org/en/latest/basics/basics-yoda.html
+
+https://psychoinformatics-de.github.io/rdm-course/02-structuring-data/index.html#example-structure-yoda-principles
+
+----
+
+<!-- .slide: data-transition="fade" -->
+### DataLad or not but ...
+
+become friends with YODA and its principles
+
+- keep **all** materials under VCS
+  - keep your containers and their construction recipes under VCS
+- adhere to a consistent and modular structure
+- be portable: avoid absolute paths, do **not** look up
+
+----
+
+# Thank you!
+
+## Follow YODA and
+### Let the efficiency and reproducibility be with you
+
+<a href="https://github.com/myyoda/poster/blob/master/ohbm2018.pdf" target="_blank"> <img  style="height:450px;margin:20px" data-src="pics/yoda.svg"/></a>
+
+<!-- .element: style="font-size:0.6em" -->
+
+</textarea></section>
+</section>
+
+
+<!-- background slide , Needs tune up of config below
+
+<section data-background="pics/con-ccn-dartmouth-letterhead.svg"  data-background-opacity="100%" data-background-size="95%" data-background-position="top">
+</section>
+-->
+
+<!-- End of slides -->
+
+
+			</div>
+		</div>
+
+		<script src="reveal.js/dist/reveal.js"></script>
+		<script src="reveal.js/plugin/notes/notes.js"></script>
+		<script src="reveal.js/plugin/markdown/markdown.js"></script>
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+		<script src="reveal.js-mermaid-plugin/plugin/mermaid/mermaid.js"></script>
+		<script>
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+				plugins: [ RevealMarkdown, RevealHighlight, RevealNotes, RevealMermaid ]
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+	</body>
+</html>

+ Yaroslav O. Halchenko + @yarikoptic + @yarikoptic@fosstodon.org +
+ Center for Open Neuroscience + Department of Psychological and Brain Sciences + Center for Cognitive Neuroscience + Dartmouth College + New Hampshire, USA + + +	+