Migrate model card from transformers-repo

Read announcement at https://discuss.huggingface.co/t/announcement-all-model-cards-will-be-migrated-to-hf-co-model-repos/2755
Original file history: https://github.com/huggingface/transformers/commits/master/model_cards/squeezebert/squeezebert-mnli/README.md

README.md

@@ -0,0 +1,67 @@
+language: en
+license: bsd
+datasets:
+- bookcorpus
+- wikipedia
+---
+
+# SqueezeBERT pretrained model
+
+This model, `squeezebert-mnli`, has been pretrained for the English language using a masked language modeling (MLM) and Sentence Order Prediction (SOP) objective and finetuned on the [Multi-Genre Natural Language Inference (MNLI)](https://cims.nyu.edu/~sbowman/multinli/) dataset.
+SqueezeBERT was introduced in [this paper](https://arxiv.org/abs/2006.11316). This model is case-insensitive. The model architecture is similar to BERT-base, but with the pointwise fully-connected layers replaced with [grouped convolutions](https://blog.yani.io/filter-group-tutorial/).
+The authors found that SqueezeBERT is 4.3x faster than `bert-base-uncased` on a Google Pixel 3 smartphone.
+
+
+## Pretraining
+
+### Pretraining data
+- [BookCorpus](https://yknzhu.wixsite.com/mbweb), a dataset consisting of thousands of unpublished books
+- [English Wikipedia](https://en.wikipedia.org/wiki/English_Wikipedia)
+
+### Pretraining procedure
+The model is pretrained using the Masked Language Model (MLM) and Sentence Order Prediction (SOP) tasks.
+(Author's note: If you decide to pretrain your own model, and you prefer to train with MLM only, that should work too.)
+
+From the SqueezeBERT paper:
+> We pretrain SqueezeBERT from scratch (without distillation) using the [LAMB](https://arxiv.org/abs/1904.00962) optimizer, and we employ the hyperparameters recommended by the LAMB authors: a global batch size of 8192, a learning rate of 2.5e-3, and a warmup proportion of 0.28. Following the LAMB paper's recommendations, we pretrain for 56k steps with a maximum sequence length of 128 and then for 6k steps with a maximum sequence length of 512.
+
+## Finetuning
+
+The SqueezeBERT paper presents 2 approaches to finetuning the model:
+- "finetuning without bells and whistles" -- after pretraining the SqueezeBERT model, finetune it on each GLUE task
+- "finetuning with bells and whistles" -- after pretraining the SqueezeBERT model, finetune it on a MNLI with distillation from a teacher model. Then, use the MNLI-finetuned SqueezeBERT model as a student model to finetune on each of the other GLUE tasks (e.g. RTE, MRPC, …) with distillation from a task-specific teacher model.
+
+A detailed discussion of the hyperparameters used for finetuning is provided in the appendix of the [SqueezeBERT paper](https://arxiv.org/abs/2006.11316).
+Note that finetuning SqueezeBERT with distillation is not yet implemented in this repo. If the author (Forrest Iandola - [email protected]) gets enough encouragement from the user community, he will add example code to Transformers for finetuning SqueezeBERT with distillation.
+
+This model, `squeezebert/squeezebert-mnli`, is the "trained with bells and whistles" MNLI-finetuned SqueezeBERT model.
+
+### How to finetune
+To try finetuning SqueezeBERT on the [MRPC](https://www.microsoft.com/en-us/download/details.aspx?id=52398) text classification task, you can run the following command:
+```
+./utils/download_glue_data.py
+
+python examples/text-classification/run_glue.py \
+    --model_name_or_path squeezebert-base-headless \
+    --task_name mrpc \
+    --data_dir ./glue_data/MRPC \
+    --output_dir ./models/squeezebert_mrpc \
+    --overwrite_output_dir \
+    --do_train \
+    --do_eval \
+    --num_train_epochs 10 \
+    --learning_rate 3e-05 \
+    --per_device_train_batch_size 16 \
+    --save_steps 20000
+
+```
+
+## BibTeX entry and citation info
+```
+@article{2020_SqueezeBERT,
+     author = {Forrest N. Iandola and Albert E. Shaw and Ravi Krishna and Kurt W. Keutzer},
+     title = {{SqueezeBERT}: What can computer vision teach NLP about efficient neural networks?},
+     journal = {arXiv:2006.11316},
+     year = {2020}
+}
+```