Self-Supervised Learning for 3-D Point Clouds Based on a Masked Linear Autoencoder
Bibliographic record
Abstract
Motivated by the success of a masked autoencoder in three-dimensional (3D) point cloud-based learning, this study proposes an innovative framework for self-supervised learning on 3D point clouds with linear complexity. In the proposed framework, every input point cloud is divided into multiple point patches, which are randomly masked at different ratios. Then, unmasked point patches are then fed to an improved Transformer model, which uses an advanced linear self-attention mechanism autoencoder to learn high-level features. The pre-training objective is to recover the masked patches under the guidance of the unmasked point patches’ features obtained by the designed Transformer. Further, a linear self-attention mechanism is designed to use three projection matrices to decompose the original scaled dot-product attention into smaller parts, using the properties of low-rank and linear decomposition to reduce the time complexity from quadratic to linear. The results of extensive experiments demonstrate that the proposed pre-trained model can achieve high accuracy of 93.6% and 84.77% on the ModelNet40 and ScanObjectNN datasets, respectively, at a masking ratio of 40%. In addition, the results show that the proposed method, which uses a linear self-attention mechanism, can enhance the computational efficiency by significantly reducing inference time and minimizing the storage memory requirements for <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> , <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> , and <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> (Query, Key, and Value) matrices compared with the existing methods. Finally, the results indicate that the proposed method can achieve state-of-the-art performance on the classification ModelNet40 dataset.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".