Looped Transformers as Programmable Computers
Authors: Angeliki Giannou, Shashank Rajput, Jy-yong Sohn, Kangwook Lee, Jason D. Lee, Dimitris Papailiopoulos
AI-generated Key Points
- The paper is titled "Looped Transformers as Programmable Computers"
- The authors present a framework for using transformer networks as universal computers
- Transformers are programmed with specific weights and placed in a loop, with the input sequence acting as a punchcard containing instructions and memory for data read/writes
- A constant number of encoder layers can emulate basic computing blocks such as embedding edit operations, non-linear functions, function calls, program counters, and conditional branches
- Using these building blocks, they are able to emulate a small instruction-set computer
- This allows them to map iterative algorithms to programs that can be executed by a looped 13-layer transformer
- The transformer can be instructed by its input to emulate various tasks such as a basic calculator, a basic linear algebra library, and in-context learning algorithms that employ backpropagation
- The work highlights the versatility of the attention mechanism and demonstrates its capability to execute full-fledged general-purpose programs even with shallow transformers.
- This paper presents an innovative approach for utilizing transformer networks as programmable computers which opens up new avenues for research in the fields of machine learning and artificial intelligence.
Abstract: We present a framework for using transformer networks as universal computers by programming them with specific weights and placing them in a loop. Our input sequence acts as a punchcard, consisting of instructions and memory for data read/writes. We demonstrate that a constant number of encoder layers can emulate basic computing blocks, including embedding edit operations, non-linear functions, function calls, program counters, and conditional branches. Using these building blocks, we emulate a small instruction-set computer. This allows us to map iterative algorithms to programs that can be executed by a looped, 13-layer transformer. We show how this transformer, instructed by its input, can emulate a basic calculator, a basic linear algebra library, and in-context learning algorithms that employ backpropagation. Our work highlights the versatility of the attention mechanism, and demonstrates that even shallow transformers can execute full-fledged, general-purpose programs.
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