T5 Efficient Base Nl48

🚀 T5-Efficient-BASE-NL48 (Deep-Narrow version)

T5-Efficient-BASE-NL48 is a variant of Google's original T5, following the T5 model architecture. It's a pretrained-only checkpoint released with the paper Scale Efficiently: Insights from Pre-training and Fine-tuning Transformers by Yi Tay, Mostafa Dehghani, Jinfeng Rao, William Fedus, Samira Abnar, Hyung Won Chung, Sharan Narang, Dani Yogatama, Ashish Vaswani, Donald Metzler. This model shows that a Deep-Narrow architecture can achieve better downstream performance compared to other models with a similar number of parameters.

✨ Features

The paper suggests that a Deep-Narrow model architecture is more favorable for downstream performance than other architectures with a similar parameter count. To quote the paper:

We generally recommend a DeepNarrow strategy where the model’s depth is preferentially increased before considering any other forms of uniform scaling across other dimensions. This is largely due to how much depth influences the Pareto-frontier as shown in earlier sections of the paper. Specifically, a tall small (deep and narrow) model is generally more efficient compared to the base model. Likewise, a tall base model might also generally more efficient compared to a large model. We generally find that, regardless of size, even if absolute performance might increase as we continue to stack layers, the relative gain of Pareto-efficiency diminishes as we increase the layers, converging at 32 to 36 layers. Finally, we note that our notion of efficiency here relates to any one compute dimension, i.e., params, FLOPs or throughput (speed). We report all three key efficiency metrics (number of params, FLOPS and speed) and leave this decision to the practitioner to decide which compute dimension to consider.

Here, model depth refers to the number of sequentially stacked transformer blocks. Each block processes a sequence of word embeddings in order.

📚 Documentation

Details model architecture

The model checkpoint - t5-efficient-base-nl48 - is of the Base model type with the following variations:

• nl is 48

It has 817.7 million parameters, requiring ca. 3270.79 MB of memory in full precision (fp32) or 1635.39 MB in half precision (fp16 or bf16).

A summary of the original T5 model architectures is as follows:

The following abbreviations are used:

If a model checkpoint has no specific el or dl, the number of encoder and decoder layers equals nl.

Pre-Training

The checkpoint was pretrained on the Colossal, Cleaned version of Common Crawl (C4) for 524288 steps using the span-based masked language modeling (MLM) objective.

Fine-Tuning

⚠️ Important Note

This model is a pretrained checkpoint and needs to be fine-tuned for practical use. It was pretrained in English, so it's only suitable for English NLP tasks.

You can follow these examples for fine-tuning the model:

PyTorch:

• Summarization
• Question Answering
• Text Classification - Note: You'll need to slightly adjust the training example to work with an encoder-decoder model.

Tensorflow:

• Summarization
• Text Classification - Note: You'll need to slightly adjust the training example to work with an encoder-decoder model.

JAX/Flax:

• Summarization
• Text Classification - Note: You'll need to slightly adjust the training example to work with an encoder-decoder model.

More information

💡 Usage Tip

We highly recommend reading the original paper Scale Efficiently: Insights from Pre-training and Fine-tuning Transformers for a deeper understanding of this model checkpoint.

As explained in the issue, checkpoints with sh or skv model architecture variations haven't been ported to Transformers because they may have limited practical use and lack detailed descriptions. These checkpoints are stored here and might be ported in the future.

📄 License

This project is licensed under the Apache-2.0 license.