攀登勃朗峰: 設(shè)定目標(biāo)，西歐的‘天花板’ This picture was taken in Chamonix, France, on an early August mor...
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Climbing Mont Blanc: Setting Sights on the Ceiling of Western Europe -
China's 'hardware capital' grinds to a halt amid coronavirus fears中國的‘硬件之都’陷入停滯，在冠狀病毒的擔(dān)憂中 Makeshift barricades and a migrant worker shortage have upended...
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Which optical illusions can animals see?動(dòng)物們可以看到哪些視錯(cuò)覺？ Many animals fall for the same optical illusions we do, providing clues a...
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Creating a black-and-white photograph goes beyond the shutter創(chuàng)造一張超越快門的黑白照片 A master photo printmaker describes the developing chemicals, tools, and ...
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400 years ago, visitors to this painted cave took hallucinogens
400年前，來到這個(gè)彩繪洞穴的游客服用了迷幻藥 People at California’s Pinwheel Cave left evidence of their alt...
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The dreamlike fungi that thrives in nature’s damp corners
夢幻般的真菌，茁壯成長在大自然潮濕的角落里。 While sheltering at home in the Netherlands, this photographer w...
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This dog-size lizard is spreading through the southeastern U.S.小狗般大小的蜥蜴正在美國東南部蔓延。 Argentine tegus are breeding in multiple states after escape or rele...
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For this family, keeping Alaska wild and pristine is a decades-long mission
對這個(gè)家庭來說，保持阿拉斯加的野性與原始是一項(xiàng)長達(dá)數(shù)十年的任務(wù) "We cannot afford to lose any more wilderness, to any c...
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Inside California’s race to contain its devastating wildfires（加州正處于控制毀滅性野火的競賽中）
A heat wave and strong Santa Ana and Diablo winds put most of the West Coast on red ale...
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Master these travel skills now for smarter trips later（現(xiàn)在精通這些旅行技能，日后旅行更精明）Learn to take better photos, speak Japanese, or be a volunteer scientist with classes, ...
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See the stunning world invisible to the naked eye（看到肉眼不可見的驚人世界）Nikon has announced the winners of its 46th annual Small World Photomicrography Competi...
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The WHO is hunting for the coronavirus’s origins. （世衛(wèi)組織正在尋找冠狀病毒的起源）Disease detectives who have worked on similar hunts say the investigation is business a...
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Numpy之線性代數(shù)
矩陣 1. 矩陣初始化 Numpy函數(shù)庫中存在兩種不同的數(shù)據(jù)類型（矩陣matrix和數(shù)組array），都可以用于處理行列表示的數(shù)字元素，雖然他們看起來很相似，但是在這兩個(gè)數(shù)據(jù)...
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矩陣求導(dǎo)術(shù)(上)
對原文進(jìn)行了重新整理排版:轉(zhuǎn)自知乎長軀鬼俠的專欄,(根據(jù)我的推測作者本科是清華大學(xué)電子工程系,現(xiàn)在卡內(nèi)基梅隆大學(xué)(世界第一CS大學(xué))計(jì)算機(jī)工程學(xué)博士生),在此獻(xiàn)上我的膝蓋.原...
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theta_best = np.linalg.inv(X_b.T.dot(X_B)).dot(X_b.T).dot(y)
其中，y的θ0 = 4，θ1 = 3都已知了，為什么還用正態(tài)方程算呢？《Scikit-Learn與TensorFlow機(jī)器學(xué)習(xí)實(shí)用指南》 第04章 訓(xùn)練模型
（第一部分 機(jī)器學(xué)習(xí)基礎(chǔ)）第01章 機(jī)器學(xué)習(xí)概覽第02章 一個(gè)完整的機(jī)器學(xué)習(xí)項(xiàng)目（上）第02章 一個(gè)完整的機(jī)器學(xué)習(xí)項(xiàng)目（下）第03章 分類第04章 訓(xùn)練模型第05章 支持向量...
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附錄6.習(xí)題3多對多關(guān)聯(lián)的表，如何手動(dòng)生成第三張表？ 在Django中，服務(wù)端給客戶端響應(yīng)信息有幾種方式？分別是什么？ HTTPresponse， jsonresponse, redire...
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附錄5.習(xí)題2Django中查詢queryset時(shí)什么情況下用Q方法 F:對數(shù)據(jù)本身的不同字段進(jìn)行操作 如:比較和更新，對數(shù)據(jù)進(jìn)行加減操作Q：用于構(gòu)造復(fù)雜的查詢條件 如：& |操作 Dja...
