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Excalidraw Data

Text Elements

LoRA Architecture

x

Input

(k × 1)

W₀

(Frozen)

Pretrained Weights

d × k

A

Down-project

r × k

B

Up-project

d × r

h

Output

(d × 1)

h = W₀x + (α/r)·BAx

• A, B: Trainable adapters

• r: Rank (hyperparameter)

• α: Scaling factor

Parameter Savings

Full Fine-tune: d × k params

LoRA: r × k + d × r params

Pretrained Path

LoRA Adapter Path