Keep in mind: KANs may not be proper for text classification (or even NLP?), at least in our research. Extra experiments must be conducted to prove this.

This repo uses Kolmogorov-Arnold Networks (KANs) for text classification over GLUE tasks (RTE, CoLA, MRPC, etc). Our paper will be published in arXiv soon.

Requirements

• Python >= 3.9.7
• Install pykan (https://github.com/KindXiaoming/pykan)
• requirements.txt

Training

We use bert-base-cased as the pre-trained model for producing embeddings (pooled_outputs) in the training process. All models have 768 input size, 64 hidden neurons, and 2 output classes (0 & 1). The training was performed on Tesla V100 16GB, 10 epochs, lr = 2e-5 for all transformer models, and lr = 2e-3 for other models.

TransformerEfficientKAN

python run_train.py --mode "train" --network "trans_effi_kan" --em_model_name "bert-base-cased" --ds_name "mrpc" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 768 --n_hidden 64 --n_class 2

TransformerFastKAN

python run_train.py --mode "train" --network "trans_fast_kan" --em_model_name "bert-base-cased" --ds_name "mrpc" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 768 --n_hidden 64 --n_class 2

TransformerFasterKAN

python run_train.py --mode "train" --network "trans_faster_kan" --em_model_name "bert-base-cased" --ds_name "mrpc" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 768 --n_hidden 64 --n_class 2

TransformerMLP

python run_train.py --mode "train" --network "mlp" --em_model_name "bert-base-cased" --ds_name "mrpc" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 768 --n_hidden 64 --n_class 2

TransformerClassifier (with Dropout and Linear)

python run_train.py --mode "train" --network "classifier" --em_model_name "bert-base-cased" --ds_name "mrpc" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 768 --n_hidden 64 --n_class 2

Original KAN

The training takes a very long time when the model infers outputs with an input size of 768 (outputs = KAN(texts)). Therefore, we must reduce the embedding size from 768 to 8 (n_size*m_size) by using reduce_size() in utils.py. The smaller the input size, the faster the training time.

def reduce_size(embeddings, n_size = 1, m_size = 8):
    second_dim = list(embeddings.shape)[-1]
    first_dim = list(embeddings.shape)[0]
    embeddings = torch.reshape(embeddings, (first_dim, int(second_dim/(n_size*m_size)), n_size*m_size))
    embeddings = torch.sum(embeddings, (1), keepdim = True).squeeze()
    return embeddings

Then, we can reluctantly run the training:

python run_train.py --mode "train" --network "kan" --em_model_name "bert-base-cased" --ds_name "wnli" --epochs 10 --batch_size 4 --max_len 512 --n_size 1 --m_size 8 --n_hidden 64 --n_class 2 --device "cpu"

Parameters

• mode: working mode ("train" or "test")
• network: type of model (efficientkan, TransformerClassifier, mlp)
• em_model_name: the model offers embeddings (BERT)
• ds_name: dataset name
• epochs: the number of epochs
• batch_size: the training batch size
• max_len: the maximum length of input text
• n_size, m_size: We consider the input size a matrix with n_size x m_size. For example, BERT offers 768 input size (1 x 768).
• n_hidden: The number of hidden neurons. We use only 1 hidden layer. You can modify the code for more layers.
• n_class: The number of classes. For GLUE tasks, there are only 2 classes (0 & 1)
• embed_type: the type of embeddings (pool, last hidden, or weight)
• device: use "cuda" or "cpu"

Results

CoLA (10 epochs)

Network	Training Accuracy	Val Accuracy	Training time (seconds)
trans_mlp	0.9897	0.8282	2798
trans_classifier	0.9619	0.8282	2802
trans_effi_kan	0.9635	0.8292	2827
trans_fast_kan	0.9949	0.8206	2831
trans_faster_kan	0.9756	0.8215	2818
effi_kan	0.749	0.7458	951
fast_kan	0.7501	0.742	937
faster_kan	0.7235	0.7315	924

MRPC (10 epochs)

Network	Training Accuracy	Val Accuracy	Training time (seconds)
trans_mlp	0.7377	0.8603	1195
trans_classifier	0.9866	0.8848	1204
trans_effi_kan	0.9986	0.8676	1219
trans_fast_kan	0.9422	0.8554	1214
trans_faster_kan	0.9591	0.8701	1207
effi_kan	0.6955	0.7255	407
fast_kan	0.7009	0.7157	401
faster_kan	0.6848	0.7059	395

RTE (10 epochs)

Network	Training Accuracy	Val Accuracy	Training time (seconds)
trans_mlp	0.9302	0.675	821
trans_classifier	0.8475	0.625	818
trans_effi_kan	0.9069	0.675	826
trans_fast_kan	0.9394	0.6071	831
trans_faster_kan	0.9639	0.6964	829
effi_kan	0.5004	0.5214	277
fast_kan	0.5269	0.5429	273
faster_kan	0.496	0.5214	269

References

• https://github.com/Blealtan/efficient-kan
• https://github.com/KindXiaoming/pykan
• https://github.com/AthanasiosDelis/faster-kan
• https://github.com/ZiyaoLi/fast-kan/

Contact

If you have any questions, please contact: tahoangthang@gmail.com. If you want to know more about me, please visit website: https://tahoangthang.com.