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| "paper_id": "2021", | |
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| "date_generated": "2023-01-19T07:51:37.899672Z" | |
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| "title": "Interactive Assignments for Teaching Structured Neural NLP", | |
| "authors": [ | |
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| "email": "dgaddy@berkeley.edu" | |
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| "abstract": "We present a set of assignments for a graduatelevel NLP course. Assignments are designed to be interactive, easily gradable, and to give students hands-on experience with several key types of structure (sequences, tags, parse trees, and logical forms), modern neural architectures (LSTMs and Transformers), inference algorithms (dynamic programs and approximate search) and training methods (full and weak supervision). We designed assignments to build incrementally both within each assignment and across assignments, with the goal of enabling students to undertake graduate-level research in NLP by the end of the course.", | |
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| "text": "We present a set of assignments for a graduatelevel NLP course. Assignments are designed to be interactive, easily gradable, and to give students hands-on experience with several key types of structure (sequences, tags, parse trees, and logical forms), modern neural architectures (LSTMs and Transformers), inference algorithms (dynamic programs and approximate search) and training methods (full and weak supervision). We designed assignments to build incrementally both within each assignment and across assignments, with the goal of enabling students to undertake graduate-level research in NLP by the end of the course.", | |
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| "section": "Abstract", | |
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| "text": "Our course contains five implementation projects focusing on neural methods for structured prediction tasks in NLP. Over a range of tasks from language modeling to machine translation to syntactic and semantic parsing, the projects cover methods such as LSTMs and Transformers, dynamic programming, beam search, and weak supervision (learning from denotations). Our aim was to let students incrementally and interactively develop models and see their effectiveness on real NLP datasets. Section 2 describes the tasks and objectives of the projects in more detail. Links to assignments are available at https://sites.google.com/ view/nlp-assignments.", | |
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| "section": "Overview", | |
| "sec_num": "1" | |
| }, | |
| { | |
| "text": "Our course is designed for early-stage graduate students in computer science. We expect students to have a good background in machine learning, including prior experience with implementing neural networks. Many of our students will go on to conduct research in NLP or related machine learning disciplines. Some advanced undergraduates may also join the course if they have sufficient background and an interest in NLP research.", | |
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| "section": "Target Audience", | |
| "sec_num": "1.1" | |
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| { | |
| "text": "Our course is 14 weeks long. The projects fill nearly the entire semester, with roughly 2 weeks given to complete each project. We used lectures to cover the projects' problems and methods at a high level; however, the projects require students to be relatively skilled at independent implementation.", | |
| "cite_spans": [], | |
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| "section": "Course Structure", | |
| "sec_num": "1.2" | |
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| { | |
| "text": "The content of our projects was chosen to cover key topics along three primary dimensions: application tasks, neural components, and inference mechanisms. Our projects introduce students to some of the core tasks in NLP, including language modeling, machine translation, syntactic parsing, and semantic parsing. Key neural network models for NLP are also introduced, covering recurrent networks, attention mechanisms, and the Transformer architecture (Vaswani et al., 2017) . Finally, the projects cover inference mechanisms for NLP, including beam search and dynamic programming methods like CKY.", | |
| "cite_spans": [ | |
| { | |
| "start": 451, | |
| "end": 473, | |
| "text": "(Vaswani et al., 2017)", | |
| "ref_id": "BIBREF12" | |
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| "section": "Design Strategy", | |
| "sec_num": "1.3" | |
| }, | |
| { | |
| "text": "All projects are implemented as interactive Python notebooks designed for use on Google's Colab infrastructure. 1 This setup allows students to use GPUs for free and with minimal setup. The notebooks consist of instructions interleaved with code blocks for students to fill in. We provide scaffolding code with less pedagogically-central components like data loading already filled in, so that students can focus on the learning objectives for the projects. Students implement neural network components using the PyTorch framework (Paszke et al., 2019) .", | |
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| { | |
| "start": 531, | |
| "end": 552, | |
| "text": "(Paszke et al., 2019)", | |
| "ref_id": "BIBREF10" | |
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| "section": "Design Strategy", | |
| "sec_num": "1.3" | |
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| "text": "Each project is broken down into a series of modules that can be verified for correctness before moving on. For example, when implementing a neural machine translation system, the students first implement and verify a basic sequence-to-sequence model, then attention, and finally beam search. This setup allows students to debug each component individually and allows instructors to give partial credit for each module. The modules are designed to validate student code without waiting for long training runs, with a total model training time of less than one hour per project.", | |
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| "section": "Design Strategy", | |
| "sec_num": "1.3" | |
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| { | |
| "text": "Our projects are graded primarily with scripted autograders hosted on Gradescope, 2 allowing a class of hundreds of students to be administered by a small course staff. Grades are generally based on accuracy on a held-out test set, where students are given inputs for this set and submit their model's predictions to the grader. While students cannot see their results on the held-out set until after the due date, the assignments include specific targets for validation set accuracies that can be used by students to verify the correctness of their solutions.", | |
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| "sec_num": "1.3" | |
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| "text": "Each project concludes with an open-ended section where the students experiment with modifications or ablations to the models implemented and submit a 1-page report describing the motivation behind their contribution and an analysis of their results. This section gives students more of a chance to explore their own ideas and can also help distinguish students who are putting in extra effort on the projects.", | |
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| "section": "Design Strategy", | |
| "sec_num": "1.3" | |
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| "text": "This project serves primarily as an introduction to the project infrastructure and to the PyTorch framework. Students implement a classifier to predict the most common part-of-speech tag for English word types from the words' characters. Students first implement a simple neural model based on pooling character embeddings, then a slightly more complex model with character n-gram representations. This project provides much more detailed instructions than later projects to help students who are less familiar with deep learning implementation, walking them through each step of the training and modeling code.", | |
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| "section": "Project 0: Intro to PyTorch Mini-Project", | |
| "sec_num": "2.1" | |
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| "text": "This project introduces students to sequential output prediction, using classical statistical methods and auto-regressive neural modeling. Students implement a series of language models of increasing complexity and train them on English text. First they implement a basic n-gram model, then add backoff and Kneser-Ney smoothing (Ney et al., 1994) . Next, they implement a feed-forward neural n-gram model, and an LSTM language model (Hochreiter and Schmidhuber, 1997) . The last section of this project is an open-ended exploration where students can try any method to further improve results, either from a list of ideas we provided or an idea of their own.", | |
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| "end": 346, | |
| "text": "(Ney et al., 1994)", | |
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| "text": "(Hochreiter and Schmidhuber, 1997)", | |
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| "section": "Project 1: Language Modeling", | |
| "sec_num": "2.2" | |
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| "text": "This project covers conditional language modeling, using neural sequence-to-sequence models with attention. Students incrementally implement a neural machine translation model to translate from German to English on the Multi30K dataset (Elliott et al., 2016) . This dataset is simpler than standard translation benchmarks and affords training and evaluating an effective model in a matter of minutes rather than days, allowing students to interactively develop and debug models. Students first implement a baseline LSTM-based sequenceto-sequence model (Sutskever et al., 2014) without attention, view the model's predictions, and evaluate performance using greedy decoding. Then, students incrementally add an attention mechanism (Bahdanau et al., 2015) and beam search decoding. Finally, students visualize the model's attention distributions.", | |
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| "text": "(Elliott et al., 2016)", | |
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| "section": "Project 2: Neural Machine Translation", | |
| "sec_num": "2.3" | |
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| "text": "This project covers constituency parsing, the Transformer neural network architecture (Vaswani et al., 2017) , and structured decoding via dynamic programming. Students first implement a Transformer encoder and validate it using a part-of-speech tagging task on the English Penn Treebank (Marcus et al., 1993) . Then, students incrementally build a Transformer-based parser by first constructing a model that makes constituency and labeling decisions for each span in a sentence, then implementing CKY decoding (Cocke, 1970; Kasami, 1966; Younger, 1967) to ensure the resulting output is a tree. The resulting model, which is a small version of the parser of Kitaev and Klein (2018) , achieves reasonable performance on the English Penn Treebank in under half an hour of training.", | |
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| "text": "(Cocke, 1970;", | |
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| "text": "Kasami, 1966;", | |
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| "section": "Project 3: Constituency Parsing and Transformers", | |
| "sec_num": "2.4" | |
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| { | |
| "text": "This project introduces students to predicting executable logical forms and to training with weak supervision. Students implement a neural semantic parser for the GEOQA geographical question answering dataset of Krishnamurthy and Kollar (2013) . This dataset contains English questions about simple relational databases. To familiarize themselves with the syntax and semantics of the dataset, students first implement a simple execution method which evaluates a logical form on a database to produce an answer. To produce logical forms from questions, students then implement a sequence-to-sequence architecture with a constrained decoder and a copy mechanism (Jia and Liang, 2016) . Students verify their model by training first in a supervised setting with known logical forms, then finally train it only from questionanswer pairs by searching over latent logical forms.", | |
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| "text": "(Jia and Liang, 2016)", | |
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| "section": "Project 4: Semantic Parsing", | |
| "sec_num": "2.5" | |
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| "text": "An initial iteration of the course was taught to 60 students, and an offering for over 100 students is in progress. Overall, we have found the projects to be a great success.", | |
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| "section": "Findings in Initial Course Offerings", | |
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| "text": "In the first iteration of the course, 81% of students completed the course and submitted all five projects. From a mid-semester survey, students reported taking 19.88 hours on average to complete Project 1. We observed that students with no prior experience programming with deep learning frameworks took significantly longer on the projects and required more assistance. In future semesters, we intend to strengthen the deep learning prerequisites required for the course to ensure adequate background for success.", | |
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| "section": "Findings in Initial Course Offerings", | |
| "sec_num": "3" | |
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| "text": "The online project infrastructure worked with minimal issues. While the Colab platform does have the downside of timeouts due to inactivity, we believe the use of free GPU resources outweighed this cost. By encouraging students to download checkpoints after training runs, they were able to avoid re-training after each timeout. A handful of students who spent very long stretches of time on the projects in a single day reported having temporary limits placed on GPU usage (e.g. after 8+ hours of continuous use), but these limits could be circumvented by logging in with a separate account.", | |
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| "text": "Most students were able to successfully complete the majority of each assignment, but there remained some point spread to distinguish performance for grading (mean 94%, standard deviation 12%). Due to the use of autograding, instructor code grading effort totaled less than several hours per project. One aspect of grading that we are continuing to improve is the open-ended exploration report, and we plan to better define and communicate expectations in future semesters by introducing a clear rubric for the report section.", | |
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| "text": "Overall, these projects proved a valuable resource for the success of our course and for preparing students for NLP research. At the end of last year's course, one student submitted an extension of their exploration work on one project to EMNLP and presented at the conference.", | |
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