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KoDALLE

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image-20211227151557604

Training DALLE from scratch, utilizing target language's PLMs' token embedding layer and position embedding layer as text encoder.

Background

πŸ“‚ For the project details, please refer to README.pdf

  • Training DALLE model from scratch demands large size paired dataset of images and captions. For example, OpenAI DALLE is trained with more than 250 million text-image pairs for the training.
  • If the dataset isn’t large enough or is limited to specific domains, number of vocabularies in the trained DALLE model are insufficient. For instance, 1 million text captions of K-Fashion dataset only consists of more or less than 300 tokens.
  • Therefore, inferencing from such DALLE models could be problematic if the given sentence query is unconnected to the originally trained captions’ text dataset.

KoDALLE's Result on Small Size Fashion Dataset

OpenAI’s DALLE KoDALLE of HappyFace
Train Dataset Size 250 Million Pairs 0.8 Million Pairs
#Params 12 Billion 428 Million
#Layers 64 Layers 16 Layers
Computing Resource 1024 x V100 16GB 1 x V100 32GB
Text Encoder 16384 Vocab x 512 Dim BPE 32000 Vocab x 1024 Dim klue/roberta-large
Image Encoder VQVAE VQGAN
Optimizer AdamW AdamW
Learning Rate 4.5e-5 3.0e-5
Weight Decay 4.5e-3 3.0e-3
LR Scheduler ReduceLROnPlateau -

The team constructed Text to Fashion Design DALLE model in Korean language with less than 100k text-image sampled pairs.

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Generated Image image
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Generated Image image
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Generated Image image
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Generated Image image

Methodology

Experimentations were conducted with the following Korean Transformers Models’ embedding layers. The team selected klue/roberta-large as baseline in the repository considering the size of the model.

KoDALLE with klue/roberta-large's wpe and wte were trained on 32GB V100 GPU environment. Hyperparams related to the DALLE's model size are following.

'BATCH_SIZE': 40
'DEPTH': 16
'TEXT_SEQ_LEN': 128
'VOCAB_SIZE': 32000
'MODEL_DIM': 1024
'ATTN_TYPES': 'full'
'DIM_HEAD': 64
'HEADS': 8

Significance

  • Offers promising result for training from scratch on specific domains with small size dataset.
  • Introduces solution for domain specific DALLE & CLIP models to be robust on input sentence.
  • Recommends adequate text-to-image model size for given computation resource.
  • Suggests effortless method of creating DALLE & CLIP model for own languages if pretrained language model is available.

WIP

  • Add image-caption reranker(EfficientNet + Klue/roberta-large)
  • Model trained with 500k text-image pairs.
  • Modulize in python code.
  • Update Inference code.
  • Update FID and IS metrics on test and validation dataset.

Citations

@misc{ramesh2021zeroshot,
    title   = {Zero-Shot Text-to-Image Generation},
    author  = {Aditya Ramesh and Mikhail Pavlov and Gabriel Goh and Scott Gray and Chelsea Voss and Alec Radford and Mark Chen and Ilya Sutskever},
    year    = {2021},
    eprint  = {2102.12092},
    archivePrefix = {arXiv},
    primaryClass = {cs.CV}
}
@misc{esser2021taming,
    title   = {Taming Transformers for High-Resolution Image Synthesis},
    author  = {Patrick Esser and Robin Rombach and BjΓΆrn Ommer},
    year    = {2021},
    eprint  = {2012.09841},
    archivePrefix = {arXiv},
    primaryClass = {cs.CV}
}