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Table 2 The average test accuracy of the six macronutrients (R2) for long short-term memory (LSTM) using a combination of hyperparameters

From: Long short-term memory for a model-free estimation of macronutrient ion concentrations of root-zone in closed-loop soilless cultures

Number of perceptrons Time step Interval Dropout probability Learning rate R2
8 168 1 h 1.0 0.001 0.58
64 168 1 h 1.0 0.02 0.64
128 1008 10 min 0.9 0.045 0.66
256 144 10 min 0.9 0.045 0.52
512 12 1 h 0.9 0.001 0.61
512 108 1 h 0.9 0.001 0.62
512 168 1 h 0.5 0.001 0.43
512 168 1 h 0.9 0.03 0.67
512 168 1 h 0.9 0.001 0.66
512 168 1 h 1.0 0.03 0.65
512 336 30 min 0.9 0.03 0.44
512 336 1 h 0.9 0.03 0.66
1024 168 1 h 0.9 0.03 0.60
  1. A combination of hyperparameters that showed the best accuracy is in italics