A hybrid recommendation algorithm for green food based on review text and review time

Figures & data

Figure 1. General technical route.

Figure 2. Flow chart of construction of green food field dictionary.

Figure 3. Chart flow of user-green food sentiment value calculation.

Figure 4. Flow chart of implementation of hybrid recommendation.

Table 1. Performance comparisons of five emotion dictionaries.

Emotion dictionary	Recall	F1
Green food field dictionary	0.9669	0.9704
Combined popular dictionary	0.8908	0.9407
HowNet	0.822	0.9008
NTUSD	0.816	0.8972
Tsinghua	0.8059	0.891

Figure 5. Statistical chart of sentiment value distribution.

Figure 6. MAE values of the hybrid recommendation approach under different weights.

Table 2. Comparison of MAE and F1 of different recommendation approaches.

	MAE	F1
Time_HR	0.42	0.7841
HR	0.4249	0.7754
CB	0.4472	0.7545
User_CF	0.49	0.731