{"body":[{"id":"46956778243995648","sort":"1","type":1,"role":"46955279031971266","content":"周啟源覺得舍友謝晨皓說得有道理,。作為一個(gè)隊(duì)長(zhǎng),，自己不能太專制,，把所有事情都留給自己干。"},{"id":"46956778780852629","sort":"1025","type":1,"role":"46955279031971266","content":"何況,，他覺得,，一個(gè)小隊(duì)，實(shí)際上,，也是成員與成員之間的“開源”,。既然自己已成寫完第一問，也有了初步的論文作品，也應(yīng)該開誠(chéng)布公,，和他們討論一番,。"},{"id":"46956780911559921","sort":"2049","type":1,"role":"46955279031971266","content":"于是，三人約好在某個(gè)教室,，討論題目的解法,。如果可以，周啟源還打算安排任務(wù),。"},{"id":"46956782270527667","sort":"3073","type":1,"role":"46955279031971266","content":"場(chǎng)景：教學(xué)樓的某一教室中"},{"id":"46956783881131257","sort":"4097","type":1,"role":"46955279031971266","content":"周啟源將帶來了兩瓶核桃奶飲料,，放在隊(duì)友許曉勝、曾喜緣的桌子上,。"},{"id":"46956787370798601","sort":"5121","type":1,"role":"46956532088681638","content":"這是我們?nèi)齻€(gè)人第一次見面哈。"},{"id":"46956798628307543","sort":"6145","type":1,"role":"46956791665755282","content":"好貼心哦,，不過,，你還是坐中間吧，這樣方便一點(diǎn),。"},{"id":"46956799970488564","sort":"7169","type":1,"role":"46955279031971266","content":"本來許曉勝坐最右邊,，曾喜緣坐中間，周啟源坐在最里面,。這么一說,，曾喜緣、周啟源兩人覺得有理,，就彼此對(duì)調(diào)了座位,。"},{"id":"46956803997008642","sort":"8193","type":1,"role":"46956532088681638","content":"（打開電腦，展示論文）第一問,，根據(jù)污水特征,，建立出水指標(biāo)預(yù)測(cè)模型，已經(jīng)寫完了,。不過,，我覺得預(yù)測(cè)的效果，似乎不太好,。"},{"id":"46956807235019886","sort":"9217","type":1,"role":"46956795692292232","content":"你是用什么方法做的呢,？"},{"id":"46956809382509375","sort":"10241","type":1,"role":"46956532088681638","content":"我用的 BP 神經(jīng)網(wǎng)絡(luò)。評(píng)價(jià)指標(biāo)是 R 方,、訓(xùn)練集,、測(cè)試集按 7:3 劃分。你們看,， R 方的值才 0.6 那樣,。"},{"id":"46956813660686609","sort":"11265","type":1,"role":"46955279031971266","content":"注：類似于統(tǒng)計(jì)學(xué)的一元線性回歸，BP 神經(jīng)網(wǎng)絡(luò)也是根據(jù)輸入，預(yù)測(cè)輸出的,。R 方是根據(jù)實(shí)際值,、預(yù)測(cè)值算出來，評(píng)價(jià)模型的擬合優(yōu)度指標(biāo),。越接近于一,，則模型預(yù)測(cè)結(jié)果越準(zhǔn)確。"},{"id":"46956814734435124","sort":"12289","type":1,"role":"46955279031971266","content":"注：訓(xùn)練集是用于訓(xùn)練模型的參數(shù),，測(cè)試集用于評(píng)價(jià)模型,。"},{"id":"46956819029401857","sort":"13313","type":1,"role":"46956795692292232","content":"（小聲嘀咕）BP 神經(jīng)網(wǎng)絡(luò)年代很久遠(yuǎn)了。"},{"id":"46956821176886774","sort":"14337","type":1,"role":"46956791665755282","content":"是的...吧,？"},{"id":"46956823324371290","sort":"15361","type":1,"role":"46956532088681638","content":"那有其他改進(jìn)的意見嗎,？"},{"id":"46956824951757738","sort":"16385","type":1,"role":"46956795692292232","content":"我覺得可以用 SVG。"},{"id":"46956827082469441","sort":"17409","type":1,"role":"46956532088681638","content":"SVG,？呃...不好意思,，我從來沒聽過 SVG 耶..."},{"id":"46956828961508724","sort":"18433","type":1,"role":"46956795692292232","content":"就是那個(gè)，emmm,，支持...向量..."},{"id":"46956832451179821","sort":"19457","type":1,"role":"46956532088681638","content":"（心想）支持向量機(jī),，簡(jiǎn)稱 SVM。在特定情況下,，也叫支持向量機(jī)回歸,，即 SVR?？赡苁窃簿売涘e(cuò)了,。"},{"id":"46956834615435077","sort":"20481","type":1,"role":"46956532088681638","content":"（心想）不過，為了避免團(tuán)隊(duì)傷了和氣,，自己也沒必要去糾正他的錯(cuò)誤,。然而，在使用 BP 神經(jīng)網(wǎng)絡(luò)之前,，周啟源已經(jīng)嘗試了,，包括 SVM 在內(nèi)的許多機(jī)器學(xué)習(xí)模型?？上?，效果都不是很好。"},{"id":"46956836746135850","sort":"21505","type":1,"role":"46956791665755282","content":"我們先不說這個(gè)了,，看看論文吧,。"},{"id":"46956838625184607","sort":"22529","type":1,"role":"46955279031971266","content":"三人大致瀏覽了 15 分鐘"},{"id":"46956841577971740","sort":"23553","type":1,"role":"46956532088681638","content":"（自謙）你們也看到了，在語言表達(dá)上,，我不是一個(gè)能手......"},{"id":"46956845621289354","sort":"24577","type":1,"role":"46956791665755282","content":"（打斷,，興奮,，提高音量）沒事呀。有我們呀,，我們來改,！"},{"id":"46956848020432156","sort":"25601","type":1,"role":"46956532088681638","content":"我有一個(gè)想法，就是之所以 BP 神經(jīng)網(wǎng)絡(luò)效果不好,，是否因?yàn)閿?shù)據(jù)帶有時(shí)序性呢,？也就是說，當(dāng)前的污水處理的出水,，與上一次污水的入水,、出水有關(guān)呢？"},{"id":"46956850184688212","sort":"26625","type":1,"role":"46956791665755282","content":"是的...吧,？"},{"id":"46956852600609335","sort":"27649","type":1,"role":"46955279031971266","content":"曾喜緣目視前方,，冷靜思考中"},{"id":"46956857952550755","sort":"28673","type":1,"role":"46956532088681638","content":"（興奮，望向曾喜緣）那么,，我可以嘗試,，用一些時(shí)序預(yù)測(cè)模型，或許會(huì)更好哦,。"},{"id":"46956859848360492","sort":"29697","type":1,"role":"46956791665755282","content":"是的...吧？"},{"id":"46956864663432577","sort":"30721","type":1,"role":"46956795692292232","content":"（手捂著額頭）先不說這個(gè),，你數(shù)據(jù)預(yù)處理方面,，是怎么做的？"},{"id":"46956867347790922","sort":"31745","type":1,"role":"46955279031971266","content":"注：機(jī)器學(xué)習(xí)中,，為了提高模型的精確性,，很有必要進(jìn)行數(shù)據(jù)的預(yù)處理。如將取值范圍弄成 0 到 1,，即歸一化,；或者均值，方差弄成 0 和 1,，即標(biāo)準(zhǔn)化,；當(dāng)然，還有缺失數(shù)據(jù)的處理,、以及自變量的降維等"},{"id":"46956869763695514","sort":"32769","type":1,"role":"46956532088681638","content":"因?yàn)槿笔?shù)據(jù)比較少,，我就直接刪除了。你們覺得,，要不要結(jié)合整體數(shù)據(jù),，算出他的分布，再填補(bǔ)進(jìn)去,？這樣做,，雖然會(huì)讓樣本增多,，但準(zhǔn)確性就降下來了。"},{"id":"46956872179616565","sort":"33793","type":1,"role":"46956791665755282","content":"是的...吧,？"},{"id":"46956874058676286","sort":"34817","type":1,"role":"46956532088681638","content":"由于自變量個(gè)數(shù)太多,，我就用 PCA 降了維。"},{"id":"46956877565104443","sort":"35841","type":1,"role":"46956795692292232","content":"（小聲嘀咕）PCA 是一個(gè)很老舊的方法了..."},{"id":"46956880786338373","sort":"36865","type":1,"role":"46956532088681638","content":"（誠(chéng)懇）那有什么更好的方法沒,？"},{"id":"46956882917040381","sort":"37889","type":1,"role":"46955279031971266","content":"曾喜緣不語,，把頭擺向一邊，冷靜思考中,。"},{"id":"46956885081308963","sort":"38913","type":1,"role":"46955279031971266","content":"會(huì)議似乎是周啟源的一言堂,，三人繼續(xù)討論，“一致”認(rèn)為第一問應(yīng)該使用,，時(shí)序模型進(jìn)行預(yù)測(cè),。至于第二問，尚未有商討結(jié)果?，F(xiàn)在已經(jīng)是下午 5 點(diǎn)了,，三人都略有疲憊。"},{"id":"46956887212009365","sort":"39937","type":1,"role":"46956795692292232","content":"你想得很好,，但我總覺得缺了點(diǎn)什么,。"},{"id":"46956890164793705","sort":"40961","type":1,"role":"46956791665755282","content":"是的...吧？可能還需要再改進(jìn)一下,。"},{"id":"46956892597495822","sort":"41985","type":1,"role":"46956532088681638","content":"嗯,，我再試一試，看看時(shí)序神經(jīng)網(wǎng)絡(luò)的效果怎么樣,。如果可以,，你們寫一下第二問吧。我自己也看看,，能不能把第二問順帶解決了,。"},{"id":"46956896070382125","sort":"43009","type":1,"role":"46956791665755282","content":"那么，時(shí)間不早了,，我先走了,。"},{"id":"46956898486290903","sort":"44033","type":1,"role":"46956795692292232","content":"我也是，我晚上還由課,。曉勝,，我們一起去吃飯吧。"},{"id":"46956900382124123","sort":"45057","type":1,"role":"46956532088681638","content":"嗯,，那你們慢走,。"},{"id":"46956902261173050","sort":"46081","type":1,"role":"46955279031971266","content":"許曉勝、曾喜緣下,，只剩周啟源一人,，獨(dú)自打代碼,。約莫 6 點(diǎn)左右，周啟源也去飯?zhí)贸燥埩?}],"sentencecount":46}