Good evening,
The perf of EigenTensor from the recent master (3.3.90 ?) seems better than 3.3.5, at least for Softmax :

3.3.5:
Bench Softmax. Repeat=10
GCC 6.1.0
Eigen version: 3.3.5
NRows NCols EMatrix ETensor
1024 1 0.0022492 0.00684219
2048 1 0.00416157 0.012961
4096 1 0.00794964 0.0259039
8192 1 0.0168335 0.0500931
16384 1 0.0333193 0.101805
32768 1 0.0660515 0.197528

3.3.90:
Bench Softmax. Repeat=10
GCC 6.1.0
Eigen version: 3.3.90
NRows NCols EMatrix ETensor
1024 1 0.00205352 0.00108232
2048 1 0.00391458 0.00210271
4096 1 0.00769969 0.00442137
8192 1 0.0157403 0.00808395
16384 1 0.031648 0.0163927
32768 1 0.0634979 0.032536

Would it be possible to do a new release of eigen (3.3.6 ? 3.3.9 ? 3.3.90 ?) with up to date EigenTensor improvements ?
Kind regards
WT