# 31 Questions

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### Gradient of dot product which contains l1-norm

Apr 6 '18 at 11:48 Jan 281

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29
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### How a constant is derived from equation in Kullback-Liebler divergence

Aug 15 '19 at 2:22 Pang 397

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26
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### Expression for maximum column index of every row in matrix

Jan 17 '19 at 21:03 EdOverflow 281
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90
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281
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82
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### What does it mean for all norms are elementwise over matrix entries

Apr 9 '18 at 7:12 Jan 281

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58
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307
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39
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### Why does introducing weight to matrix product $W_{ik}H_{kj}$ need to write the weight in three dimensions ($\pi_{ijk}$)?

Aug 17 '17 at 12:06 Jan 281
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2k
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1
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74
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83
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### Math expression for indices of non-zero values from a matrix column

Apr 7 '20 at 5:49 J.-E. Pin 33.3k

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24
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### How to proof $\sum_{l}A_l\sum_{k}B_{lk}C_{ik}D_{kj} = \sum_{k}(\sum_{l}A_lB_{lk})C_{ik}D_{kj}$?

Sep 12 '18 at 9:18 Jan 281

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49
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### Is $\sum\limits_k \frac{W_{ik} H_{kj}}{\sum\limits_k W_{ik} H_{kj}}$ = 1?

Sep 10 '18 at 20:19 Did 268k
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74
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### How to introduce weights for Jensen's inequality into $log\sum\sum$

Aug 28 '18 at 2:23 Jan 281
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184
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113
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26
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### Why is $Ω(H) ≤ Ω(\hat{H}) + \langle ∇Ω(\hat{H}), H − \hat{H} \rangle$ true?

Jun 26 '18 at 12:27 Jan 281

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41
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### If algorithm is derived from majorization-minimization, is it correct to measure error from the majorized form?

Mar 25 '18 at 14:24 Jan 281

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60
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45
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73
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88
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63
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### What does Proof. "function 1 = function 2 is trivially met" mean?

Aug 14 '17 at 7:06 Jan 281

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61
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### What do the (+) and (-) operators after the divergence symbol ($\nabla$) mean?

Aug 9 '17 at 11:41 Jan 281

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213
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66
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### What is the $\boldsymbol{l_{1,q}}$ norm (with comma)?

Jun 20 '17 at 14:11 MPW 39.7k

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