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-rw-r--r--ot/optim.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/ot/optim.py b/ot/optim.py
index dcefd24..2b8f565 100644
--- a/ot/optim.py
+++ b/ot/optim.py
@@ -159,6 +159,8 @@ def cg(a,b,M,reg,f,df,G0=None,numItermax = 200,stopThr=1e-9,verbose=False,log=Fa
# problem linearization
Mi=M+reg*df(G)
+ # set M positive
+ Mi+=Mi.min()
# solve linear program
Gc=emd(a,b,Mi)