Useful callbacks for vision models
Shows how the input would have to change to move the prediction from one logit to the other
ConfusedLogitCallback(top_k, projection_factor=3, min_logit_value=5.0, logging_batch_interval=20, max_logit_difference=0.1)
Takes the logit predictions of a model and when the probabilities of two classes are very close, the model doesn’t have high certainty that it should pick one vs the other class.
This callback shows how the input would have to change to swing the model from one label prediction to the other.
In this case, the network predicts a 5… but gives almost equal probability to an 8. The images show what about the original 5 would have to change to make it more like a 5 or more like an 8.
For each confused logit the confused images are generated by taking the gradient from a logit wrt an input for the top two closest logits.
from pl_bolts.callbacks.vision import ConfusedLogitCallback trainer = Trainer(callbacks=[ConfusedLogitCallback()])
whenever called, this model will look for self.last_batch and self.last_logits in the LightningModule
this callback supports tensorboard only right now
top_k¶ – How many “offending” images we should plot
projection_factor¶ – How much to multiply the input image to make it look more like this logit label
min_logit_value¶ – Only consider logit values above this threshold
logging_batch_interval¶ – how frequently to inspect/potentially plot something
max_logit_difference¶ – when the top 2 logits are within this threshold we consider them confused
Tensorboard Image Generator¶
Generates images from a generative model and plots to tensorboard
Generates images and logs to tensorboard. Your model must implement the forward function for generation
# model must have img_dim arg model.img_dim = (1, 28, 28) # model forward must work for sampling z = torch.rand(batch_size, latent_dim) img_samples = your_model(z)
from pl_bolts.callbacks import TensorboardGenerativeModelImageSampler trainer = Trainer(callbacks=[TensorboardGenerativeModelImageSampler()])