Hidden features of Python
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Arelle®
Overview Arelle was created in 2010 to improve the accessibility and usability of XBRL™ in order to increase the worldwide adoption of the standard. It seeks to provide the XBRL community with a free and easy to use open source platform for XBRL, supporting XBRL and its extension features in an extensible manner. It does this in a compact yet robust framework that can be used as a desktop applic
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Hadoop Streaming で Locality-Sensitive Hashing を実装してみる | Atsushi TATSUMA Web Page
はじめに 研究室では、大規模データベースを対象とした検索インデックスについて研究しています。 分散処理によるインデックス作成を考えていて、今回 Hadoop Streaming でどこまでできるかを試すべく、 Locality-Sensitive Hashing (LSH) を実装してみました。 実装したアルゴリズムについて LSH にはいくつかのアルゴリズムのバリエーションがあります。 LSH の詳細は、ブログなり論文なり本なりありますので、ここでは省略しますが、 類似したデータに同じハッシュ値を与えることで、検索を高速化しようというアイディアです。 このハッシュ値には、0101 とかの短いバイナリ符号が好まれます。 今回は、いくつかある LSH のアルゴリズムのうち、 Charikar,M., Similarity estimation techniques from ro
Building a Vector Space Search Engine in Python - Joseph Wilk
A vector space search involves converting documents into vectors. Each dimension within the vectors represents a term. If a document contains that term then the value within the vector is greater than zero. Here is an implementation of Vector space searching using python (2.4+). 1 Stemming & Stop words Fetch all terms within documents and clean – use a stemmer to reduce. A stemmer takes words and
Latent Semantic Analysis in Python - Joseph Wilk
Latent Semantic Analysis (LSA) is a mathematical method that tries to bring out latent relationships within a collection of documents. Rather than looking at each document isolated from the others it looks at all the documents as a whole and the terms within them to identify relationships. An example of LSA: Using a search engine search for “sand”. Documents are returned which do not contain the s
Creating a range of dates in Python
I want to create a list of dates, starting with today, and going back an arbitrary number of days, say, in my example 100 days. Is there a better way to do it than this? import datetime a = datetime.datetime.today() numdays = 100 dateList = [] for x in range (0, numdays): dateList.append(a - datetime.timedelta(days = x)) print dateList
8.1. datetime — 基本的な日付型および時間型 — Python 3.6.5 ドキュメント
datetime — Basic date and time types¶ Source code: Lib/datetime.py The datetime module supplies classes for manipulating dates and times. While date and time arithmetic is supported, the focus of the implementation is on efficient attribute extraction for output formatting and manipulation. See also Module calendarGeneral calendar related functions. Module timeTime access and conversions. Module z
Xoilac TV - Trực Tiếp Bóng Đá HD 24/7 - Xem Xôi Lạc TV #1 VN
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