This uses fbprophet.diagnostics.performance_metrics to compute the metrics. Valid values of metric are 'mse', 'rmse', 'mae', 'mape', and 'coverage'.
plot_cross_validation_metric(df_cv, metric, rolling_window = 0.1)
The output from fbprophet.diagnostics.cross_validation.
Metric name, one of 'mse', 'rmse', 'mae', 'mape', 'coverage'.
Proportion of data to use for rolling average of metric. In [0, 1]. Defaults to 0.1.
A ggplot2 plot.
rolling_window is the proportion of data included in the rolling window of aggregation. The default value of 0.1 means 10 aggregation for computing the metric.
As a concrete example, if metric='mse', then this plot will show the squared error for each cross validation prediction, along with the MSE averaged over rolling windows of 10