Skip to main content

Day 16 (7/29/19): Achieving Better Results by Adjusting Learning Rate

This morning I reviewed the results of the experiments I ran over the weekend. However, the tensorboard graphs showed that after a certain number of batches, every model appeared to stop learning on the training data, essentially becoming stagnant at the end. Below is a graphical representation of those models over the weekend.


I realized that the training script I was using didn't explicitly reset the optimizer and learning rate scheduler after each batch as I intended. Therefore, as the learning rate was continuously getting smaller, the model was no longer learning in the further batches. I adjusted my script to reset the parameters of both the optimizer and scheduler after each batch of 20 classes and restarted many of the experiments. I also added some more capabilities to load and save the models by creating dictionaries to track how the accuracy and omega values (against default values of offline model) change as the number of batches and classes increase. I hope to have results from the Offline, Full Rehearsal, and L2SP models with Baseline OOD Recognition tomorrow. 

Comments

Popular posts from this blog

Day 22 (8/6/19): Streaming Linear Discriminant Analysis

Today I tested the previously trained models using the Stanford dogs dataset as the inter dataset evaluator for OOD instead of the Oxford flowers dataset. However, as expected, the omega values for performance were pretty much the same as before and didn't make much of a difference as the datasets varied.  I also implemented a streaming linear discriminant analysis model (SLDA) which differed from the previous incrementally trained models. This model didn't perform as well in terms of accuracy however as only the last layer of the model was trained and streaming is more of a difficult task. Nevertheless, we did show that Mahalanobis can be used in a streaming paradigm to recover some OOD performance in an online setting. This is likely to be a large focus of my presentation as it has never been discussed prior. Tomorrow, I plan to implement an L2SP model with elastic weight consolidation as well as iCarl to serve as two more baselines to compare our experiments to.

Day 24 (8/8/19): Multilayer Perceptron Experiment

I continued gathering more results for my presentation today, and the data table is coming along nicely. We are able to see a significant trend that using Mahalanobis instead of Baseline Thresholding recovers much of the OOD recognition that is lost with streaming or incremental models. The SLDA model appears to be a lightweight, accurate streaming model which can be paired with Mahalanobis to be useful as an embedded agent in the real world. For the purposes of demonstrating catastrophic forgetting, I ran five experiments and averaged the results for a simple incrementally trained MLP. Obviously, the model failed miserably and was achieving only about 1% of the accuracy of the offline model. Including this is only to show how other forms of streaming and incremental models are necessary to develop lifelong learning agents. A diagram of a simple multilayer perceptron.