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We present Montblanc, a GPU implementation of the Radio interferometer measurement equation(RIME) in support of the Bayesian inference for radio observations(BIRO) technique. BIRO uses Bayesian inference to select sky models that best match the visibilities observed by a radio interferometer. To accomplish this, BIRO evaluates the RIME multiple times, varying sky model parameters to produce multiple model visibilities. χ2values computed from the model and observed visibilities are used as likelihood values to drive the Bayesian sampling process and select the best sky model.