Teacher-Student Feature Distillation with Thresholded Difference Updates
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Solution Overview
Problem
Conventional deep learning distillation methods struggle to achieve identical feature vectors between a teacher and student model when there is a high degree of architectural difference, such as reduced parameters or layers.
Innovation Solution
A method involving calculating a difference vector between feature vectors of a teacher and student model, and updating student model parameters based on this difference vector, with increased changes for elements exceeding a threshold value, to align the feature vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If distillation is performed with significantly reduced number of parameters in the student model, then the network complexity is reduced, but the feature vector similarity between student and teacher models deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the loss function weights during the distillation process. Specifically, it modifies the weighting parameters in the composite loss function (combining KL divergence loss and feature vector similarity loss) to adaptively balance the trade-off between maintaining feature vector similarity and accommodating the reduced capacity of the student model with significantly fewer parameters.
Solution Approach 2:
The patent implements dynamics by making the distillation process adaptive through dynamic weight adjustment in the loss function. The weighting parameters are not fixed but are adjusted during training to optimize the balance between preserving feature vector similarity and adapting to the student model's reduced parameter capacity, making the distillation process responsive to the model architecture differences.
2Ease of manufacture
If conventional distillation methods are used, then the learning process is simpler, but the feature vector accuracy between student and teacher models deteriorates when architectural differences are large
Solution Approach 1:
The patent applies the composite materials principle by creating a composite loss function that combines multiple loss components (KL divergence loss and feature vector similarity loss) with dynamically adjusted weights. This composite approach integrates the benefits of conventional distillation (simplicity through KL divergence) with enhanced feature vector accuracy (through additional similarity constraint), achieving both goals simultaneously despite large architectural differences.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the loss function weights during training. This allows the system to maintain the simplicity of the distillation framework while improving feature vector accuracy through adaptive parameter modification, resolving the contradiction between ease of implementation and precision.
3Productivity
If the student model has significantly fewer parameters, then the computational efficiency is improved, but the ability to reproduce teacher model feature vectors deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the loss function weights to compensate for the student model's reduced parameter capacity. The adaptive weighting mechanism increases the emphasis on feature vector similarity loss when architectural differences are large, enabling the smaller student model to better reproduce teacher model feature vectors despite its limited capacity.
Solution Approach 2:
The patent implements local quality by applying different loss weights to different aspects of the distillation objective. Specifically, it places greater emphasis on feature vector similarity (local quality) when the student model has significantly fewer parameters, rather than treating all distillation objectives uniformly, thereby optimizing the reproduction capability for the specific architectural constraints.
Data Source
AI summary
An apparatus calculates a difference between a first vector extracted by a first unit and a second vector extracted by a second unit with a smaller amount of calculation than the first unit, generates a changed difference by changing a value of an element in the difference, and updates a parameter of the second unit based on the changed difference. An amount of change from a value of an element of the difference corresponding to a first element exceeding a threshold value in the first vector to a value of an element of the changed difference corresponding to the first element is larger than an amount of change from a value of an element of the difference corresponding to a second element not exceeding the threshold value in the first vector to a value of an element of the changed difference corresponding to the second element.


