Arun Kumar

I write primary-source explainers on transformers and LLM inference — reading the papers and checking what they actually measured. More at diffstudy.com

Joined on Sep 6, 2026

Arun Kumar

Oct 3

Fine-tuning a 7B model needs 112 GB. The model is only 14 GB of it.

#machinelearning #llm #ai #deeplearning

3 min read

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Arun Kumar

Sep 28

If nothing was concatenated, it isn't prompt injection

#security #llm #cybersecurity #ai

3 min read

Arun Kumar

Sep 24

MCP doesn't replace function calling. Your MCP client still emits one.

#mcp #llm #ai #machinelearning

3 min read

Arun Kumar

Sep 18

GRPO doesn't remove the reward model. It removes the critic.

#ai #machinelearning #llm #computerscience

3 min read

Arun Kumar

Sep 14

Muon doesn't replace AdamW. Every Muon run still has AdamW in it.

#ai #machinelearning #deeplearning #computerscience

3 min read

Arun Kumar

Sep 10

"RoPE extrapolates to longer contexts" — someone finally measured it, and it doesn't

#ai #machinelearning #llm #computerscience

3 min read

Arun Kumar

Sep 6

Speculative decoding won't change your model's distribution. It might still change your output.

#computerscience #ai #machinelearning #llm

4 min read

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Arun Kumar

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Fine-tuning a 7B model needs 112 GB. The model is only 14 GB of it.

Want to connect with Arun Kumar?

If nothing was concatenated, it isn't prompt injection

MCP doesn't replace function calling. Your MCP client still emits one.

GRPO doesn't remove the reward model. It removes the critic.

Muon doesn't replace AdamW. Every Muon run still has AdamW in it.

"RoPE extrapolates to longer contexts" — someone finally measured it, and it doesn't

Speculative decoding won't change your model's distribution. It might still change your output.