Abstract:Dodajanje primerov v referenčno vložitev t-SNE odstrani razlike med različnimi podatkovnimi viri Tehnike zmanjševanja dimenzij, kot je t-SNE, nam omogočajo gradnjo informativnih vizualizacij visokorazsežnih naborov podatkov. Pri analizi več naborov podatkov hkrati te metode pogosto ne uspejo odkriti pomenljive skupine, temveč izpostavijo nezaželene razlike med podatkovnimi viri. Da bi odstranili vplive posameznih podatkovnih virov in odkrili strukture skupne vsem podatkom, predlagamo teoretično utemeljeno meto… Show more
“…We represent each reaction as a reaction Morgan difference fingerprint 39 of 2048 bits with both reagent- and non-reagent weight equal to 1. Using an implementation of parametric t-SNE from OpenTSNE, 40 we project the fingerprint vectors of reactions in USPTO 50K on the 2D plane, and then use the same t-SNE model to obtain the projections of reactions in Reaxys. The absolute values of the coordinates of the t-SNE embeddings of reaction vectors bear no physical meaning.…”
A molecular transformer predicts reagents for organic reactions. It is also able to replace questionable reagents in reaction data, e.g. USPTO, to enable better product prediction models to be trained on these new data.
“…We represent each reaction as a reaction Morgan difference fingerprint 39 of 2048 bits with both reagent- and non-reagent weight equal to 1. Using an implementation of parametric t-SNE from OpenTSNE, 40 we project the fingerprint vectors of reactions in USPTO 50K on the 2D plane, and then use the same t-SNE model to obtain the projections of reactions in Reaxys. The absolute values of the coordinates of the t-SNE embeddings of reaction vectors bear no physical meaning.…”
A molecular transformer predicts reagents for organic reactions. It is also able to replace questionable reagents in reaction data, e.g. USPTO, to enable better product prediction models to be trained on these new data.
“…Sequence space projections: To visualise sequence space of our aptamer selection experiments, we chose to reduce the dimensionality and project it into two dimensions using t‐Stochastic Neighbour Embedding (t‐SNE) [22] implemented in the openTSNE package v.0.4.0 [37] . Here, we used a perplexity of 50, a cosine metric, and principal component analysis for initialisation, with all other parameters as default.…”
The spontaneous emergence of function from diverse RNA sequence pools is widely considered an important transition in the origin of life. Here we show that diverse sequence pools are not a prerequisite for the emergence of function. Starting five independent selection experiments each from a single RNA seed sequence ‐ comprising a central homopolymeric poly‐A (or poly‐U) segment flanked by different conserved primer binding sites ‐ we observe transformation (continuous drift) of the seeds into low diversity sequence pools by mutation, truncation and recombination without ever reaching that of a random pool even after 24 rounds. Upon continuous error prone replication and selection for ATP binding we isolate specific ATP‐ or GTP‐binding aptamers with low micromolar affinities. Our results have implications for early RNA evolution in the light of the high mutation rates associated with both non‐enzymatic and enzymatic prebiotic RNA replication.
“…This descriptor uniquely identifies crystal structures and is a continuous metric, meaning that the distance (measured using the Chebyshev metric) is zero for similar crystals. We embed the AMD to two dimensions using t-SNE, implented in openTSNE, 30 using the Chebyshev distance metric and nearest neighbour descent. 31 Fig.…”
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