We consider the task of text attribute transfer: transforming a sentence to alter a specific attribute (e.g., sentiment) while preserving its attribute-independent content (e.g., changing "screen is just the right size" to "screen is too small"). Our training data includes only sentences labeled with their attribute (e.g., positive or negative), but not pairs of sentences that differ only in their attributes, so we must learn to disentangle attributes from attributeindependent content in an unsupervised way. Previous work using adversarial methods has struggled to produce high-quality outputs. In this paper, we propose simpler methods motivated by the observation that text attributes are often marked by distinctive phrases (e.g., "too small"). Our strongest method extracts content words by deleting phrases associated with the sentence's original attribute value, retrieves new phrases associated with the target attribute, and uses a neural model to fluently combine these into a final output. On human evaluation, our best method generates grammatical and appropriate responses on 22% more inputs than the best previous system, averaged over three attribute transfer datasets: altering sentiment of reviews on Yelp, altering sentiment of reviews on Amazon, and altering image captions to be more romantic or humorous.
Copper antimony sulfides (CAS) are of great interest for their applications in solar absorbers. Here, a new series of CAS materials is reported, namely the Sr 1Àx Pb x CuSbS 3 (x ¼ 0-0.2), which are synthesized via solid state reactions. The new compound SrCuSbS 3 crystallizes in the orthorhombic space group Pbam and consists of 3D [CuSbS 3 ] 2À extended framework and Sr 2þ ions. The [CuSbS 3 ] 2À framework is constructed by [CuS 3 ] 5À one-dimensional chains and [SbS 3 ] 3À triangular pyramids. The compound is a semiconductor with a band gap of 1.91 eV. Partial replacement of Sr 2þ by Pb 2þ can narrow the band gap to 1.63 eV when the doping concentration is up to 20%. First-principles calculations reveal that the SrCuSbS 3 compound is a direct band gap semiconductor with the valence band maximum composed of Cu-3d states and the conduction band minimum composed of Sb-5p-S-3p states. The Pb orbitals play critical roles in narrowing the band gap of Sr 1-x Pb x CuSbS 3 (x ¼ 0-0.2). The series of CAS materials also show evident photoelectric response properties which demonstrate their potential for applications for photovoltaic devices. In addition, these CAS materials are good photocatalysts for the photodegradation reaction of Rhodamine B (RhB). The Sr 0.8 Pb 0.2 CuSbS 3 powder can degrade 100% of RhB within 3 h under simulated sunlight.
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