ple (torch.FloatTensor of shape (batch_size, num_channels, height, width) for images) —
Computed sample (x_{t-1}) of previous timestep. prev_sample should be used as next model input in the
denoising loop.   derivative (torch.FloatTensor of shape (batch_size, num_channels, height, width) for images) —
Derivative of predicted original image sample (x_0).   pred_original_sample (torch.FloatTensor of shape (batch_size, num_channels, height, width)