8,725 machine learning methods and techniques
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Gradient Quantization with Adaptive Levels/Multiplier
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MetaNeXt is a meta-architecture abstracted from ConvNeXt, which can be regarded as a simpler version obtained from MetaFormer by merging token mixer and MLP into one.
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Soft Split and Soft Composition are video frame based operations used in the FuseFormer architecture, specifically the FuseFormer blocks. We softly split each frame into overlapped patches and then softly composite them back, by using an unfold and fold operator with patch size being greater than patch stride . When compositing patches back to its original spatial shape, we add up feature values at each overlapping spatial location of neighboring patches.
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While the typical approach to leverage transfer learning in image segmentation models involves replacing the entire encoder, this can restrict the customization and unique strengths of the main network. To address this limitation, we propose a hybrid transfer learning strategy that incorporates pre-trained convolutional layers from two distinct architectures (e.g., VGG16 and DenseNet201), allowing us to leverage the advantages of transfer learning while preserving the core features and characteristics of the base model's architecture.
CutBlur is a data augmentation method that is specifically designed for the low-level vision tasks. It cuts a low-resolution patch and pastes it to the corresponding high-resolution image region and vice versa. The key intuition of Cutblur is to enable a model to learn not only "how" but also "where" to super-resolve an image. By doing so, the model can understand "how much" instead of blindly learning to apply super-resolution to every given pixel.
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Visformer, or Vision-friendly Transformer, is an architecture that combines Transformer-based architectural features with those from convolutional neural network architectures. Visformer adopts the stage-wise design for higher base performance. But self-attentions are only utilized in the last two stages, considering that self-attention in the high-resolution stage is relatively inefficient even when the FLOPs are balanced. Visformer employs bottleneck blocks in the first stage and utilizes group 3 ร 3 convolutions in bottleneck blocks inspired by ResNeXt. It also introduces BatchNorm to patch embedding modules as in CNNs.
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A Harmonic Network, or Harm-Net, is a type of convolutional neural network that replaces convolutional layers with "harmonic blocks" that use Discrete Cosine Transform (DCT) filters. These blocks can be useful in truncating high-frequency information (possible due to the redundancies in the spectral domain).
NoisyNet-Dueling is a modification of a Dueling Network that utilises noisy linear layers for exploration instead of -greedy exploration as in the original Dueling formulation.
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Multi-Heads of Mixed Attention
The multi-head of mixed attention combines both self- and cross-attentions, encouraging high-level learning of interactions between entities captured in the various attention features. It is build with several attention heads, each of the head can implement either self or cross attention. A self attention is when the key and query features are the same or come from the same domain features. A cross attention is when the key and query features are generated from different features. Modeling MHMA allows a model to identity the relationship between features of different domains. This is very useful in tasks involving relationship modeling such as human-object interaction, tool-tissue interaction, man-machine interaction, human-computer interface, etc.
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DU-GAN is a generative adversarial network for LDCT denoising in medical imaging. The generator produces denoised LDCT images, and two independent branches with U-Net based discriminators perform at the image and gradient domains. The U-Net based discriminator provides both global structure and local per-pixel feedback to the generator. Furthermore, the image discriminator encourages the generator to produce photo-realistic CT images while the gradient discriminator is utilized for better edge and alleviating streak artifacts caused by photon starvation.
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Group Decreasing Network
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Sparse Switchable Normalization (SSN) is a variant on Switchable Normalization where the importance ratios are constrained to be sparse. Unlike and constraints that impose difficulties in optimization, the constrained optimization problem is turned into feed-forward computation through SparseMax, which is a sparse version of softmax.
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Memory-Associated Differential Learning
Memory-Associated Differential (MAD) Learning was developed to inference from the memorized facts that we already know to predict what we want to know. Image source: Luo et al.
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