---
title: "A Comparison of Vector-based Representations — Blacoe 2012"
description: "The paper asks how much the choice of word-level vectors matters when building meaning representations for phrases and sentences, as opposed to the…"
authors: ["William Blacoe", "Mirella Lapata"]
year: 2012
venue: "Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning"
source: "https://aclanthology.org/D12-1050/"
licence: "CC BY-NC-SA 3.0 (ACL Anthology, before 2016)"
licence_url: "https://creativecommons.org/licenses/by-nc-sa/3.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/blacoe-2012-comparison-vector-based-representations-semantic/"
---
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# A Comparison of Vector-based Representations for Semantic Composition

**Authors:** William Blacoe, [Mirella Lapata](https://md.research.elamur.ai/free/en/authors/mirella-lapata/) · **Year:** 2012 · **Venue:** Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning · **Licence:** [CC BY-NC-SA 3.0 (ACL Anthology, before 2016)](https://creativecommons.org/licenses/by-nc-sa/3.0/)

**Links:** [Publisher's page](https://aclanthology.org/D12-1050/) · [PDF](https://aclanthology.org/D12-1050.pdf) · [OpenAlex](https://openalex.org/W97201605)

**Citations:** 230 citations (openalex-snapshot · 2026-10-14) · [90](#cited-by) in our library, of the 140884 papers whose bibliographies we read

## Summary
The paper asks how much the choice of word-level vectors matters when building meaning representations for phrases and sentences, as opposed to the choice of composition function. The authors cross three distributional representations with three ways of combining them, giving nine compositional models. The representations are a simple window-based co-occurrence space built from the BNC (SDS), Collobert and Weston-style neural embeddings (NLM), and Baroni and Lenci's Distributional Memory tensor (DM). The composition methods are vector addition, element-wise multiplication, and a recursive autoencoder (RAE). The models are tested on two tasks: human similarity judgments for short phrases (the Mitchell and Lapata 2010 data) and sentence-level paraphrase detection on the Microsoft Research paraphrase corpus. Across both tasks, cheap, syntax-blind combinations over the simple space hold their own against far more expensive alternatives. The authors conclude that the match between representation and composition method matters more than corpus or vector size. This matters for anyone deciding whether heavy resources such as parsers, huge corpora or long neural training are actually worth the cost.

## Key points
- **SDS:** This space uses a ±5-word window over the ~100M-token BNC. Its 2,000 dimensions are frequent context words, each weighted by a probability ratio. It needs only tokenization: no parsing and no learning.
- **NLM:** The embeddings were trained on the BNC and tuned on WordSim353. The best setting was 50 dimensions, a context window of 4 and a learning rate of 10⁻⁹. Final training took about 2 weeks (≈1.5×10⁹ iterations).
- **DM:** This representation is a third-order tensor of weighted word–link–word tuples. It is built from a parsed corpus of roughly 3 billion words.
- **Paraphrase detection results:** The classifier used only three features: the cosine between composed sentence vectors, the two sentence lengths, and unigram overlap.
  - SDS + multiplication reached 73.0 accuracy and 82.3 F1.
  - DM + addition reached 73.5 accuracy and 82.2 F1.
  - The baseline scored 66.5 / 79.9, and Socher et al. (2011a) scored 76.8 / 83.6.
  - Accuracy gaps of 3.3 or more are significant at p\<0.01.
- **Phrase similarity:** Syntax-oblivious addition and multiplication beat the RAE. Neither NLM nor DM surpassed the simple SDS space. The RAE did better when its output fed a paraphrase classifier.

## Interesting ideas
- **Factorial design:** Every representation is crossed with every composition function, which separates the effect of the word vectors from the effect of the combiner. This setup suits any pipeline where input features and an aggregation step are chosen independently.
- **Two-level evaluation:** Pairing a phrase-level task that stresses the representation with a sentence-level task that stresses composition covers compositionality from short to long units. A single benchmark could hide weaknesses at one of these levels.
- **Minimal probing classifier:** Restricting the downstream classifier to a cosine, two lengths and word overlap keeps the test about the quality of the composed vectors rather than feature engineering. This is a cheap, transparent way to compare embedding methods on new languages or domains.
- **Simple baselines first:** A tokenization-only co-occurrence space with addition or multiplication should be the first baseline. It can match parsed, billion-word resources, which is relevant for lower-resource settings such as Ukrainian.
- **Joint design of representation and composition:** The authors suggest that word vectors and the composition rule should be learned together rather than chosen separately. This principle could guide future model design.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

Fields: [Natural language processing](https://md.research.elamur.ai/free/en/shelves/nlp/)

## Cited by

Cited by

90 papers of our library cite it (of the 140884 whose bibliographies we read); 9 of them have a page here, 81 not yet.

- [Don't count, predict! A systematic comparison of context-counting vs. context-predicting semantic vectors](https://md.research.elamur.ai/free/en/papers/baroni-2014-don-t-count-predict-systematic/)
- [One Vector is Not Enough: Entity-Augmented Distributed Semantics for Discourse Relations](https://md.research.elamur.ai/free/en/papers/ji-2015-one-vector-is-not-enough/)
- [Recurrent Convolutional Neural Networks for Discourse Compositionality](https://md.research.elamur.ai/free/en/papers/kalchbrenner-2013-recurrent-convolutional-neural-networks-discourse/)
- [Linguistic Regularities in Sparse and Explicit Word Representations](https://md.research.elamur.ai/free/en/papers/levy-2014-linguistic-regularities-sparse-explicit-word/)
- [A Systematic Study of Neural Discourse Models for Implicit Discourse Relation](https://md.research.elamur.ai/free/en/papers/rutherford-2017-systematic-study-neural-discourse-models/)
- [From Paraphrase Database to Compositional Paraphrase Model and Back](https://md.research.elamur.ai/free/en/papers/wieting-2015-paraphrase-database-compositional-paraphrase-model/)
- [SemEval-2015 Task 1: Paraphrase and Semantic Similarity in Twitter (PIT)](https://md.research.elamur.ai/free/en/papers/xu-2015-semeval-2015-task-1-paraphrase/)
- [ABCNN: Attention-Based Convolutional Neural Network for Modeling Sentence Pairs](https://md.research.elamur.ai/free/en/papers/yin-2016-abcnn-attention-based-convolutional-neural/)
- [TwoWingOS: A Two-Wing Optimization Strategy for Evidential Claim Verification](https://md.research.elamur.ai/free/en/papers/yin-2018-twowingos-two-wing-optimization-strategy/)

## Cite

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{blacoe2012comparison,
  title = {{A Comparison of Vector-based Representations for Semantic Composition}},
  author = {Blacoe, William and Lapata, Mirella},
  booktitle = {Proceedings of the 2012 Joint Conference on Empirical Methods in Natural Language Processing and Computational Natural Language Learning},
  year = {2012},
  url = {https://aclanthology.org/D12-1050/}
}
```

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## References

37 references, 8 of them with a card of ours. ↗ leads to the work, «find» searches for one we have no id for yet.

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