  In this letter, we have carried out an independent validation of the Gaia
EDR3 photometry using about 10,000 Landolt standard stars from Clem & Landolt
(2013). Using a machine learning technique, the UBVRI magnitudes are converted
into the Gaia magnitudes and colors and then compared to those in the EDR3,
with the effect of metallicity incorporated. Our result confirms the
significant improvements in the calibration process of the Gaia EDR3. Yet
modest trends up to 10 mmag with G magnitude are found for all the magnitudes
and colors for the 10 < G < 19 mag range, particularly for the bright and faint
ends. With the aid of synthetic magnitudes computed on the CALSPEC spectra with
the Gaia EDR3 passbands, absolute corrections are further obtained, paving the
way for optimal usage of the Gaia EDR3 photometry in high accuracy
investigations.

Solar and Stellar Astrophysics;Astrophysics of Galaxies