Figure 8
The figure contains two graphs arranged side by side, labeled as Part (a) and (b). Both graphs share the same axis structure: the horizontal axis is labeled “Data sample” and ranges from 0 to 40 in increments of 20 units, while the vertical axis is labeled “Thermal Conductivity (watts per (meter kelvin))” and ranges from negative 1.0 to 3.0 in increments of 0.5. Each graph contains a legend indicating three elements: magenta bars representing “Error-test”, a black line representing “Predicted-test”, and a red line representing “Observed-test”. Part (a) is titled “G P R”. The red and blue lines both start at 0.7 at 0 samples and track each other moderately well. Both lines oscillate between 0.0 and 1.9, reaching a peak of 0.9 at 38 samples. A prominent magenta starts at 0 at 0 samples, extending down to approximately negative 0.7 at 4 samples, which is the lowest point. The bars vary between 0.1 and negative 0.2 throughout the plot except for the lowest point. Part (b) is titled “E T”. The red line (observed) starts at 0.7 at 0 samples, while the blue line (predicted) starts at 0.6. Both lines oscillate between 0.0 and 1.0, reaching a peak of 0.9 at 38 samples. The lines fluctuate around 0.3 to 0.4 through the middle samples. Magenta error bars appear frequently throughout, varying between 0.3 and negative 0.3. The highest point is reached at 20 samples. Part (c) is titled “L R”. The red line (observed) starts at 0.7 at 0 samples, while the blue line (predicted) starts at 0.25. Both lines oscillate between 0.0 and 1.0, with the red line reaching a peak of 0.9 at 38 samples and the blue line showing a similar peak at 0.6 at the same location. Magenta error bars appear frequently throughout, varying between 0.6 and negative 0.3. The highest point is reached at 2 samples. Part (d) is titled “N N”. The red and blue lines both start at 0.7 at 0 samples and track each other moderately well. Both lines oscillate between 0.0 and 1.9. The red line reaches its peak at 0.9 at 38 samples, while the blue at 0.7 at 4 samples. Magenta error bars appear at several intervals, varying between 0.1 and negative 0.6. The lowest point reaches approximately negative 0.6 at 4 samples. Part (e) is titled “R T”. The red line (observed) starts at 0.7 at 0 samples, while the blue line (predicted) starts at 0.25. Both lines oscillate between 0.0 and 1.0, with the red line reaching a peak of 0.9 at 38 samples and the blue line showing a similar peak at 0.6 at the same location. The red and blue lines almost follow the same path, except for sample values like 9–15, 35–38, et cetra, where the blue line is a little above the red line, while at sample values 6–7, 33–34, et cetra, where the blue line is below the red line. Magenta error bars vary between 0.4 and negative 0.4. Part (f) is titled “S V M”. The red line (observed) starts at 0.7 at 0 samples, while the blue line (predicted) starts at 0.25, reaching a peak of 0.9 at 38 samples. Magenta error bars appear at various intervals, varying between 0.5 and negative 0.1. The highest point reaches approximately 0.5 at 2 samples. Note: All numerical values are approximated.Comparison of actual and predicted thermal conductivity in the testing phase ((a) GPR, (b) ET, (c) LR, (d) NN, (e) RT and (f) SVM)