# 稀疏编码自编码表达

### From Ufldl

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:<math>J(A, s) = \lVert As - x \rVert_2^2 + \lambda \lVert s \rVert_1</math> | :<math>J(A, s) = \lVert As - x \rVert_2^2 + \lambda \lVert s \rVert_1</math> | ||

- | (If you are unfamiliar with the notation,<math>\lVert x \rVert_k</math> refers to the Lk norm of the x which is equal to <math>\sum \ | + | (If you are unfamiliar with the notation,<math>\lVert x \rVert_k</math> refers to the Lk norm of the x which is equal to <math>\sum \mid x^k_i\mid ^\frac{1}{k}</math>. The L2 norm is the familiar Euclidean norm, while the L1 norm is the sum of absolute values of the elements of the vector) |

[初译] | [初译] |