Chapter 2 Exploitation rate results
Here we present the results for best performances found by each selection scheme on the exploitation rate diagnostic with valley crossing integrated. 50 replicates are conducted for each scheme explored.
2.1 Data setup
DIR = paste(DATA_DIR,'EXPLOITATION_RATE/', sep = "", collapse = NULL)
over_time_df <- read.csv(paste(DIR,'over-time.csv', sep = "", collapse = NULL), header = TRUE, stringsAsFactors = FALSE)
over_time_df$scheme <- factor(over_time_df$scheme, levels = NAMES)
best_df <- read.csv(paste(DIR,'best.csv', sep = "", collapse = NULL), header = TRUE, stringsAsFactors = FALSE)
best_df$acro <- factor(best_df$acro, levels = ACRO)2.2 Performance over time
Best performance in a population over time. Data points on the graph is the average performance across 50 replicates every 2000 generations. Shading comes from the best and worse performance across 50 replicates.
lines = over_time_df %>%
group_by(scheme, gen) %>%
dplyr::summarise(
min = min(pop_fit_max) / DIMENSIONALITY,
mean = mean(pop_fit_max) / DIMENSIONALITY,
max = max(pop_fit_max) / DIMENSIONALITY
)## `summarise()` has grouped output by 'scheme'. You can override using the
## `.groups` argument.lines$scheme <- factor(lines$scheme, levels = c('Truncation (tru)','Tournament (tor)','Lexicase (lex)','Random (ran)','Genotypic Fitness Sharing (gfs)','Phenotypic Fitness Sharing (pfs)','Nondominated Sorting (nds)','Novelty Search (nov)'))
over_time_plot = ggplot(lines, aes(x=gen, y=mean, group = scheme, fill = scheme, color = scheme, shape = scheme)) +
geom_ribbon(aes(ymin = min, ymax = max), alpha = 0.1) +
geom_line(size = 0.5) +
geom_point(data = filter(lines, gen %% 2000 == 0 & gen != 0), size = 1.5, stroke = 2.0, alpha = 1.0) +
scale_y_continuous(
name="Average trait score",
limits=c(0, 45),
breaks=seq(0,45, 15)
) +
scale_x_continuous(
name="Generations",
limits=c(0, 50000),
breaks=c(0, 10000, 20000, 30000, 40000, 50000),
labels=c("0e+4", "1e+4", "2e+4", "3e+4", "4e+4", "5e+4")
) +
scale_shape_manual(values=c(5,3,1,20,2,6,0,4))+
scale_colour_manual(values = c('#332288','#88CCEE','#EE7733','#CCBB44','#EE3377','#117733','#882255','#44AA99')) +
scale_fill_manual(values = c('#332288','#88CCEE','#EE7733','#CCBB44','#EE3377','#117733','#882255','#44AA99')) +
ggtitle('Performance over time')+
p_theme +
guides(
shape=guide_legend(ncol=2, title.position = "left", title = 'Selection \nScheme'),
color=guide_legend(ncol=2, title.position = "left", title = 'Selection \nScheme'),
fill=guide_legend(ncol=2, title.position = "left", title = 'Selection \nScheme')
)
over_time_plot
2.3 Best performance throughout
Best performance reached throughout 50,000 generations in a population.
plot = filter(best_df, var == 'pop_fit_max') %>%
ggplot(., aes(x = acro, y = val / DIMENSIONALITY, color = acro, fill = acro, shape = acro)) +
geom_flat_violin(position = position_nudge(x = .1, y = 0), scale = 'width', alpha = 0.2, width = 1.5) +
geom_boxplot(color = 'black', width = .07, outlier.shape = NA, alpha = 0.0, size = 1.0, position = position_nudge(x = .16, y = 0)) +
geom_point(position = position_jitter(width = 0.03, height = 0.02), size = 2.0, alpha = 1.0) +
scale_y_continuous(
name="Average trait score",
limits=c(0, 45),
breaks=seq(0,45, 15)
) +
scale_x_discrete(
name="Scheme"
)+
scale_shape_manual(values=SHAPE)+
scale_colour_manual(values = cb_palette, ) +
scale_fill_manual(values = cb_palette) +
ggtitle('Best performance')+
p_theme
plot_grid(
plot +
theme(legend.position="none"),
legend,
nrow=2,
rel_heights = c(3,1)
)
2.3.1 Stats
Summary statistics for the best performance.
performance = filter(best_df, var == 'pop_fit_max')
performance$acro = factor(performance$acro, levels = c('gfs','pfs','nov','tru','tor','nds','ran','lex'))
performance %>%
group_by(acro) %>%
dplyr::summarise(
count = n(),
na_cnt = sum(is.na(val)),
min = min(val / DIMENSIONALITY, na.rm = TRUE),
median = median(val / DIMENSIONALITY, na.rm = TRUE),
mean = mean(val / DIMENSIONALITY, na.rm = TRUE),
max = max(val / DIMENSIONALITY, na.rm = TRUE),
IQR = IQR(val / DIMENSIONALITY, na.rm = TRUE)
)## # A tibble: 8 x 8
## acro count na_cnt min median mean max IQR
## <fct> <int> <int> <dbl> <dbl> <dbl> <dbl> <dbl>
## 1 gfs 50 0 41.2 42.9 42.9 44.9 1.05
## 2 pfs 50 0 40.2 43.1 42.9 44.8 1.28
## 3 nov 50 0 16.0 18.6 18.6 20.9 1.07
## 4 tru 50 0 17.8 18.1 18.1 18.3 0.123
## 5 tor 50 0 17.9 18.1 18.1 18.3 0.0974
## 6 nds 50 0 14.7 15.3 15.4 16.1 0.378
## 7 ran 50 0 11.1 13.0 13.1 15.7 1.39
## 8 lex 50 0 12.5 12.7 12.7 13.1 0.128Kruskal–Wallis test illustrates evidence of statistical differences.
##
## Kruskal-Wallis rank sum test
##
## data: val by acro
## Kruskal-Wallis chi-squared = 366.61, df = 7, p-value < 2.2e-16Results for post-hoc Wilcoxon rank-sum test with a Bonferroni correction.
pairwise.wilcox.test(x = performance$val, g = performance$acro, p.adjust.method = "bonferroni",
paired = FALSE, conf.int = FALSE, alternative = 'l')##
## Pairwise comparisons using Wilcoxon rank sum test with continuity correction
##
## data: performance$val and performance$acro
##
## gfs pfs nov tru tor nds ran
## pfs 1.0000 - - - - - -
## nov < 2e-16 < 2e-16 - - - - -
## tru < 2e-16 < 2e-16 0.0014 - - - -
## tor < 2e-16 < 2e-16 0.0026 1.0000 - - -
## nds < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 - -
## ran < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 1.2e-14 -
## lex < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 1.0000
##
## P value adjustment method: bonferroni2.4 Largest valley reached throughout
The largest valley reached in a single trait throughout an entire evolutionary run. To collect this value, we look through all the best-performing solutions each generation and find the largest valley reached.
plot = filter(best_df, var == 'ele_big_peak') %>%
ggplot(., aes(x = acro, y = val, color = acro, fill = acro, shape = acro)) +
geom_flat_violin(position = position_nudge(x = .1, y = 0), scale = 'width', alpha = 0.2, width = 1.5) +
geom_boxplot(color = 'black', width = .07, outlier.shape = NA, alpha = 0.0, size = 1.0, position = position_nudge(x = .16, y = 0)) +
geom_point(position = position_jitter(width = 0.03, height = 0.02), size = 2.0, alpha = 1.0) +
scale_y_continuous(
name="Valley reached",
limits=c(4.9,14.1),
breaks=c(5,10,14)
) +
scale_x_discrete(
name="Scheme"
)+
scale_shape_manual(values=SHAPE)+
scale_colour_manual(values = cb_palette, ) +
scale_fill_manual(values = cb_palette) +
ggtitle('Largest valley reached')+
p_theme
plot_grid(
plot +
theme(legend.position="none"),
legend,
nrow=2,
rel_heights = c(3,1)
)
2.4.1 Stats
Summary statistics for the largest valley crossed.
valleys = filter(best_df, var == 'ele_big_peak')
valleys$acro = factor(valleys$acro, levels = c('gfs','pfs','nds','nov','ran','lex','tru','tor'))
valleys %>%
group_by(acro) %>%
dplyr::summarise(
count = n(),
na_cnt = sum(is.na(val)),
min = min(val, na.rm = TRUE),
median = median(val, na.rm = TRUE),
mean = mean(val, na.rm = TRUE),
max = max(val, na.rm = TRUE),
IQR = IQR(val, na.rm = TRUE)
)## # A tibble: 8 x 8
## acro count na_cnt min median mean max IQR
## <fct> <int> <int> <dbl> <dbl> <dbl> <dbl> <dbl>
## 1 gfs 50 0 12 13 13.4 14 1
## 2 pfs 50 0 12 13.5 13.5 14 1
## 3 nds 50 0 10 11 11.2 13 0
## 4 nov 50 0 10 10 10.5 11 1
## 5 ran 50 0 9 10 10.1 12 0.75
## 6 lex 50 0 6 7 6.8 8 0
## 7 tru 50 0 5 6 5.92 6 0
## 8 tor 50 0 5 6 5.94 6 0Kruskal–Wallis test illustrates evidence of statistical differences.
##
## Kruskal-Wallis rank sum test
##
## data: val by acro
## Kruskal-Wallis chi-squared = 377.23, df = 7, p-value < 2.2e-16Results for post-hoc Wilcoxon rank-sum test with a Bonferroni correction.
pairwise.wilcox.test(x = valleys$val, g = valleys$acro, p.adjust.method = "bonferroni",
paired = FALSE, conf.int = FALSE, alternative = 'l')##
## Pairwise comparisons using Wilcoxon rank sum test with continuity correction
##
## data: valleys$val and valleys$acro
##
## gfs pfs nds nov ran lex tru
## pfs 1.000 - - - - - -
## nds < 2e-16 < 2e-16 - - - - -
## nov < 2e-16 < 2e-16 3.9e-08 - - - -
## ran < 2e-16 < 2e-16 2.1e-10 0.099 - - -
## lex < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 - -
## tru < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 4.6e-14 -
## tor < 2e-16 < 2e-16 < 2e-16 < 2e-16 < 2e-16 4.3e-14 1.000
##
## P value adjustment method: bonferroni