1. An apparatus comprising: an amplifier circuit including: a datapath that receives an input signal; and a power amplifier that is coupled to the datapath, wherein the power amplifier receives a first output from the datapath, and wherein the power amplifier provides a second output; an indirect learning circuit that is coupled to the amplifier circuit, wherein the indirect learning circuit iteratively adjusts predistortion data based at least in part on the first output and the second output during an indirect learning mode until convergence is reached; and a direct learning circuit that is coupled to the amplifier circuit and the indirect learning circuit and that receives the input signal, wherein the predistortion data is copied to the direct learning circuit from the indirect learning after convergence is reached, wherein the direct learning circuit adjusts the predistortion data during a direct learning mode, and wherein the direct learning circuit adjusts the operation of the datapath with the predistortion data.