Lower memory consumption in Colab demo #126
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This pull request includes a new implementation of read_ckpt, named read_ckpt_lowmem, in checkpoint.py that uses less system RAM and more device RAM so that the Colab demo will work correctly on all current TPU Colab instances. The original implementation will crash TPU Colab instances that don't have at least 13-14 GiB of system RAM.