move old resources from protocol toolkit

zero_knowledge/machine_learning/README.md

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+## zk proofs applied to ml (zkml)
+
+<br>
+
+### tl; dr
+
+<br>
+
+<p align="center">
+<img width="500"  src="https://user-images.githubusercontent.com/1130416/234938321-a0b052b6-e754-4e80-8351-0daa847ebd12.png">
+</p>
+
+<br>
+
+* **challenges:**
+  * transpile NNs into ZKP circuts (floating-point weigths -> fixed-point arithmetic)
+  * model size/depth
+* **ideas:**
+  * model authenticity
+    - assurance that the ml model is the one that run (e.g. the most accurate one)
+    - functional commitments allow the prover to establosj that it used a commited model (but no guarantess about the commited model).
+  * model integrity
+    - assurance that the same ml algorithm is ran on different data the same way
+  * attestations  
+    - integrate attestations from external parties
+   * decentralized inference or traning
+    - perform ml training in a decentralized way 
+   * proof of personhood
+ 
+ <br>
+ 
+ ---
+ 
+ ### cool resources
+ 
+ <br>
+ 
+ * **[humanness in the age of ai, by worldcoin](https://worldcoin.org/blog/engineering/humanness-in-the-age-of-ai)**
+ * **[zk-img: attested images via zk-proofs, d. kang et al.](https://arxiv.org/pdf/2211.04775.pdf)**
+ * **[checks and balances ml and zk, by a16](https://a16zcrypto.com/content/article/checks-and-balances-machine-learning-and-zero-knowledge-proofs/)**
+ * **[trustless verification of ml, by d. kang](https://ddkang.github.io/blog/2022/10/18/trustless/)**
+ * **[tachikoma, neural nets for zk proof systems](https://github.com/zk-ml/tachikoma)**
+ * **[zkml, framework for constructing proofs of ml model in zksnarks](https://github.com/ddkang/zkml)**
+ * **[ezkl, deep learning inference in zk-snark](https://github.com/zkonduit/ezkl)**
+ * **[unraveling zkml, by dr. cathie so](https://www.canva.com/design/DAFgqqAboU0/4HscC5E3YkFRFk3bB64chw/view#1)**