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Add missing reference.

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commit 03a4e3b38d321f1ba4b574f4092d183066ddafaf 1 parent 8226a98
@mblondel mblondel authored
Showing with 8 additions and 1 deletion.
  1. +8 −1 sklearn/decomposition/nmf.py
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9 sklearn/decomposition/nmf.py
@@ -324,12 +324,19 @@ class ProjectedGradientNMF(BaseEstimator, TransformerMixin):
Notes
-----
- This implements C.-J. Lin. Projected gradient methods
+ This implements
+
+ C.-J. Lin. Projected gradient methods
for non-negative matrix factorization. Neural
Computation, 19(2007), 2756-2779.
http://www.csie.ntu.edu.tw/~cjlin/nmf/
+ P. Hoyer. Non-negative Matrix Factorization with
+ Sparseness Constraints. Journal of Machine Learning
+ Research 2004.
+
NNDSVD is introduced in
+
C. Boutsidis, E. Gallopoulos: SVD based
initialization: A head start for nonnegative
matrix factorization - Pattern Recognition, 2008
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