P-Light

So what we found: upgrade tensorflow to 1.15.0 and change ```self.saver.restore(self.sess, restore_snap)``` to ```self.saver.restore(self.sess, tf.train.latest_checkpoint(restore_snap))```

@Adirosenthal540 I have no suggestions but try [this](https://stackoverflow.com/questions/45884408/tensorflow-valueerror-cant-load-save-path-when-it-is-none-in-single-shot-dete/47707275)

Pretrained models are available in TF-version kpconv. I'm looking for pytorch too.