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Gaia Data Release 3 will contain more than a billion sources with positions,parallaxes, and proper motions. In addition, for hundreds of millions of stars,it will include low-resolution blue photometer (BP) and red photometer (RP)spectra. Obtained by dispersing light with prisms, these spectra haveresolutions that are too low to allow us to measure individual spectral linesand bands. However, the combined BP/RP spectra can be used to estimate somestellar properties such as $T_{\text{eff}}$, $\log{g}$, and $\left[ \text{M} /\text{H} \right]$.  We investigate the feasibility of using the ExtraTrees algorithm to estimatethe alpha element to iron abundance ratio $\left[ \alpha / \text{H} \right]$from low-resolution BP/RP spectra.  To infer $\left[ \alpha / \text{H} \right]$ from the spectra, we createdregression models trained on two samples: a set of synthetic spectra and a setof observed spectra from stars that have known $\left[ \alpha / \text{H}\right]$ since they have been observed using HERMES. We applied each model tothe other sample and to a larger observed sample to assess the performance ofthe models. In addition, we used our models to analyse stars from theGaia-Enceladus structure.  We find that models using the ExtraTrees algorithm can be used to estimate$\left[ \alpha / \text{H} \right]$ from low-resolution BP/RP spectra of coolstars. However, they do this by exploiting correlations between $\left[ \alpha/ \text{H} \right]$ and other parameters, rather than the causal effect of$\left[ \alpha / \text{H} \right]$ on the spectrum. Hence, they are unlikely tobe useful in studies that attempt to distinguish stars that only differ in$\left[ \alpha / \text{H} \right]$.

Estimating $\left[ \alpha / \text{Fe} \right]$ from Gaia low-resolution BP/RP spectra using the ExtraTrees algorithm