Self-Modifying Code for Neural Network Computation Reduction

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Solution Overview

Problem

Neural networks, particularly those with dynamic iteration lengths, face inefficiencies due to processors that do not directly support dynamic control flow, leading to redundant computations and decreased workload throughput.

Innovation Solution

The implementation of self-modifying code that overwrites redundant instructions with NOP instructions during runtime, using a compiler to detect dynamic iteration patterns and generate additional instructions for evaluating break conditions, thereby reducing unnecessary computations through DMA engines.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If processors execute fixed instruction sequences for neural network layers, then implementation simplicity is maintained, but redundant computations occur when break conditions are met early

Engineering Contradiction:
Improveimplementation simplicityVSAvoidredundant computations
Core Design Contradiction:
Ease of manufactureVSLoss of energy

Solution Approach 1:

The patent applies dynamics by making the instruction sequence dynamic through self-modifying code. Instead of executing a fixed instruction sequence, the processor dynamically modifies its own instruction stream at runtime based on break conditions. When a break condition is met, the processor overwrites subsequent instructions with NOP instructions, allowing the execution flow to adapt dynamically and eliminate redundant computations while maintaining implementation simplicity.

Inventive Principle:
Principle #15Dynamics

2Reliability

If the processor executes all compiled instructions for a neural network layer, then complete computation is ensured, but execution time increases due to redundant operations

Engineering Contradiction:
Improvecomputation completenessVSAvoidexecution time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-compiling all possible instruction sequences for neural network layers, including those that may eventually become redundant. The break condition checking mechanism is embedded within these pre-compiled instructions. At runtime, when a break condition is detected, the self-modifying code immediately overwrites subsequent instructions with NOPs, preventing wasted execution time while ensuring that all necessary computations are completed beforehand in the compilation phase.

Inventive Principle:
Principle #10Preliminary action

3Productivity

If dynamic control flow is implemented to reduce redundant computations, then computation efficiency improves, but processor complexity increases

Engineering Contradiction:
Improvecomputation efficiencyVSAvoidprocessor complexity
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

The patent applies self-service by implementing self-modifying code that allows the processor to automatically modify its own instruction stream without external intervention. The processor includes dedicated circuitry (such as a code generation unit and instruction memory) that works autonomously to detect break conditions and overwrite subsequent instructions with NOP instructions. This self-service mechanism enables dynamic control flow and improved computation efficiency while minimizing the need for complex external control logic.

Inventive Principle:
Principle #25Self-service

4Loss of energy

If self-modifying code is used to overwrite redundant instructions, then redundant computations are reduced, but code complexity increases

Engineering Contradiction:
Improveredundant computationsVSAvoidcode complexity
Core Design Contradiction:
Loss of energyVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary mechanism in the form of a code generation unit and instruction memory structure that mediates between the compilation phase and execution phase. During compilation, all instructions are generated and stored in instruction memory with associated break condition logic. During execution, this intermediary structure automatically handles the self-modifying code operations by detecting break conditions and overwriting subsequent instructions with NOPs through dedicated circuitry, thereby reducing redundant computations while managing code complexity through structured intermediation rather than ad-hoc modifications.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentUS12073199B2Reducing computation in neural networks using self-modifying code
Publication Date: 2024.08.27 AMAZON TECH INC
  • US12073199B2 patent drawing
  • US12073199B2 patent drawing
  • US12073199B2 patent drawing

AI summary

In various implementations, provided are systems and methods for reducing neural network processing. A compiler may generate instructions from source code for a neural network having a repeatable set of operations. The instructions may include a plurality of blocks. The compiler may add an overwrite instruction to the plurality of blocks that, when executed by one or more execution engines, triggers an overwrite action. The overwrite action causes the instructions of subsequent blocks to be overwritten with NOP instructions. The overwrite action is triggered only when a condition is satisfied.