Refactor

README.md

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+# LLM from scratch
+
+## Resources
+- [Build a Large Language Model](https://www.manning.com/books/build-a-large-language-model-from-scratch)
+- [Writing an LLM from scratch, part 28](https://www.gilesthomas.com/2025/12/llm-from-scratch-28-training-a-base-model-from-scratch)
+- [nanochat](https://github.com/karpathy/nanochat)
+
+## TODO:
+- chat cli, evaluate each epoch
+- better arch (read nanochat)
+- count tokens
+- download more data (code, full fineweb)
+- better train progress bar
+- Notes
+
+- TrainTestIterator
+  - total length
+  - deterministic shuffle
+  - prepare in parallel
+  - refactor new() into builder
+  - small texts (<|bos|>?)
+
+- Training
+  - multi-device training
+  - model parameters in file