add t5-base as usable text encoder (huggingface makes this easy)

only cosine and linear noise schedules used, just limit it to these 2…

…, so the continuous versions are easier to build

allow for config driven creation of imagen off the bat, also research…

…er must always give list of image resolutions this time around

allow for config driven creation of imagen off the bat, also research…

…er must always give list of image resolutions this time around

fix bug

add trainer class

complete the lowres augmentation level conditioning (which is basical…

…ly exactly like ddpm forward pass but for the lowres conditioning image). sampling is fixed at 0.2 (in paper they proposed 0.1 or 0.3)

allow for overriding the lowres conditioning noise level for sampling

complete the lowres augmentation level conditioning (which is basical…

…ly exactly like ddpm forward pass but for the lowres conditioning image). sampling is fixed at 0.2 (in paper they proposed 0.1 or 0.3)

more t5 fixes