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Main Authors:	Yongjie Liang, Wujie Hu, Junjie Wu, Jinzhao Wu
Format:	Artículo Open Access
Published:	Wiley 2025
Subjects:	Concurrency and Computation: Practice and Experience
Online Access:	https://onlinelibrary.wiley.com/doi/10.1002/cpe.70310
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Automated Bisimulation‐Based Similarity Measurement in Heterogeneous Information Networks Yongjie Liang Wujie Hu Junjie Wu Jinzhao Wu Concurrency and Computation: Practice and Experience ABSTRACT Heterogeneous information networks (HINs) serve as effective models for information systems characterized by diverse types of objects and relationships. Evaluating similarities among objects is crucial in various data mining applications, such as web search, label prediction, and clustering tasks. This paper presents BiSim, a novel similarity measurement method tailored for HINs. By harnessing the concept of bisimulation, BiSim evaluates node similarity by integrating both macroscopic and microscopic levels of bisimulation. Unlike existing metrics that rely on predefined metapaths, BiSim provides a universal approach to assess the structural and semantic similarity simultaneously in HINs. We thoroughly investigate BiSim's mathematical properties and demonstrate its effectiveness through comprehensive experimentation across diverse data mining tasks. 10.1002/cpe.70310 http://onlinelibrary.wiley.com/termsAndConditions#vor

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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