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README.md

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+# NPM
+
+NPM is a nonparametric masked language model, pretrained on English text data.
+It was introduced by ["Nonparametric Masked Language Modeling"][paper]
+and first released in [facebookresearch/NPM][repo].
+
+### Model description
+
+NPM consists of an encoder and a reference corpus, and models a nonparametric distribution over a reference corpus.
+The key idea is to map all the phrases in the corpus into a dense vector space using the
+encoder and, when given a query with a MASK at inference, use the encoder to locate the nearest
+phrase from the corpus and fill in the MASK.
+
+### Intended uses & limitations
+While this repo includes the encoder weights, NPM has to be used together with a datstore.
+For more details on how to use NPM, please refer to the [original repo][repo].
+
+Note that this model is primarily for filling in a MASK token. Future work can investigate how to use NPM for text generation.
+
+### Training procedure
+
+NPM was trained on English Wikipedia (August 2019) and an English portion of CC-News (Mackenzie et al. (2020), February 2019), which contains 13B tokens in total.
+NPM used the model architecture and initial weights of RoBERTa large (Liu et al., 2019), consisting of 354M parameters.
+Training is done for 100,000 steps, using thirty-two 32GB GPUs. 
+
+More details about training can be found in the [paper][paper].
+Code for training NPM can be found in the [original repo][repo].
+
+### Evaluation results
+NPM is evaluated on nine closed-set tasks (tasks with a small set of options given)
+and seven open-set tasks (tasks whose answers are arbitrary-length).
+NPM consistently outperforms significantly larger models such as GPT-3, OPT and T5.
+Detailed results can be found from the [paper][paper].
+
+### BibTeX entry and citation info
+```
+@article{ min2022nonparametric,
+    title={ Nonparametric Masked Language Modeling },
+    author={ Min, Sewon and Shi, Weijia and Lewis, Mike and Chen, Xilun and Yih, Wen-tau and Hajishirzi, Hannaneh and Zettlemoyer, Luke },
+    year={ 2022 }
+}
+```
+
+[paper]: https://arxiv.org/abs/2212.01349
+[repo]: https://github.com/facebookresearch/NPM
+
+