--sample_size option causes ValueError

[jkraybill]

When I pass --sample_size 256 as a flag to main.py, I get

ValueError: Cannot feed value of shape (256, 100) for Tensor 'z_noise:0', which has shape '(64, 100)'

When I pass --sample_size 256 and --batch_size 256, the code went into an endless loop just saying "Sample images updated!" without running each epoch.