Pytorch浼樺寲鍣ㄥ叏鎬荤粨锛堜竴锛塖GD銆丄SGD銆丷prop銆丄dagrad

鐩綍

Stream流式编程

鍐欏湪鍓嶉潰

联邦学习

涓€銆伮爐orch.optim.SGD 闅忔満姊害涓嬮檷

矢量控制

SGD浠g爜

Universal Link

SGD绠楁硶瑙f瀽

swift

1.MBGD(Mini-batch Gradient Descent)灏忔壒閲忔搴︿笅闄嶆硶

类和对象

聽2.Momentum鍔ㄩ噺

时空视频数据集

3.NAG(Nesterov accelerated聽gradient)

软件工程

SGD鎬荤粨

HashMap

浜屻€乼orch.optim.ASGD闅忔満骞冲潎姊害涓嬮檷

技术学习

涓夈€乼orch.optim.Rprop

tomcat

鍥涖€乼orch.optim.Adagrad 鑷€傚簲姊害

hibernate

Adagrad 浠g爜

IDE瀹夎

Adagrad 绠楁硶瑙f瀽

apk

AdaGrad鎬荤粨

抽象方法


jdk动态代理使用

史上最全

鍐欏湪鍓嶉潰

聽 聽 聽 聽 浼樺寲鍣ㄦ椂娣卞害瀛︿範涓殑閲嶈缁勪欢,鍦ㄦ繁搴﹀涔犱腑鏈変妇瓒宠交閲嶇殑鍦颁綅銆傚湪瀹為檯寮€鍙戜腑鎴戜滑骞朵笉鐢ㄤ翰鎵嬪疄鐜颁竴涓紭鍖栧櫒,寰堝妗嗘灦閮藉府鎴戜滑瀹炵幇濂戒簡,浣嗗鏋滀笉鏄庣櫧鍚勪釜浼樺寲鍣ㄧ殑鐗圭偣,灏卞緢闅鹃€夋嫨閫傚悎鑷繁浠诲姟鐨勪紭鍖栧櫒銆傛帴涓嬫潵鎴戜細寮€涓€涓郴鍒?#xff0c;浠ytorch涓轰緥,浠嬬粛鎵€鏈変富娴佺殑浼樺寲鍣?#xff0c;濡傛灉閮芥悶鏄庣櫧浜?#xff0c;瀵逛紭鍖栧櫒绠楁硶鐨勬帉鎻′篃灏卞樊涓嶅浜嗐€?/p>

聽 聽 聽 聽 浣滀负绯诲垪鐨勭涓€绡囨枃绔?#xff0c;鏈枃浠嬬粛Pytorch涓殑SGD銆?span style=”color:#000000;”>ASGD銆丷prop銆丄dagrad,鍏朵腑涓昏浠嬬粛SGD鍜?span style=”color:#000000;”>Adagrad銆傚洜涓鸿繖鍥涗釜浼樺寲鍣ㄥ嚭鐜扮殑姣旇緝鏃?#xff0c;閮藉瓨鍦ㄤ竴浜涚‖浼?#xff0c;鑰屼綔涓虹幇鍦ㄤ富娴佷紭鍖栧櫒鐨勫熀纭€鍙堣烦涓嶈繃,鎵€浠ヤ綔涓哄紑绔惂銆?/span>

数模

聽聽聽聽聽聽聽聽鎴戜滑瀹氫箟涓€涓€氱敤鐨勬€濊矾妗嗘灦,鏂逛究鍦ㄥ悗闈㈢悊瑙e悇绠楁硶涔嬮棿鐨勫叧绯诲拰鏀硅繘銆傞鍏堝畾涔夊緟浼樺寲鍙傛暟聽\theta,鐩爣鍑芥暟J(\theta ),瀛︿範鐜囦负聽\eta聽,鐒跺悗鎴戜滑杩涜杩唬浼樺寲,鍋囪褰撳墠鐨別poch涓?img alt=”t” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?t” />,鍙傛暟鏇存柊姝ラ濡備笅:

GD32

1. 璁$畻鐩爣鍑芥暟鍏充簬褰撳墠鍙傛暟鐨勬搴?#xff1a;聽

微信小程序

g_{t}=\bigtriangledown J(\theta _{t})聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽(1)

添加

聽2. 鏍规嵁鍘嗗彶姊害璁$畻涓€闃跺姩閲忓拰浜岄樁鍔ㄩ噺:

etl工程师

m_{t}=\phi (g_{1},g_{2}...,g_{t})聽 聽 聽 聽 聽 聽 聽 聽 (2)

软件启动报错

v_{t}=\varphi (g_{1},g_{2}...,g_{t})聽 聽 聽 聽 聽 聽 聽 聽 聽(3)

haar

聽3. 璁$畻褰撳墠鏃跺埢鐨勪笅闄嶆搴?#xff1a;聽

java工程师

\bigtriangleup _{\theta _{t}}=\eta *\frac{m_{t}}{\sqrt{v_{t}}}聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽(4)

4. 鏍规嵁涓嬮檷姊害杩涜鏇存柊: 聽

\theta _{t+1}=\theta _{t}-\bigtriangleup _{\theta _{t}}聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽(5)

聽聽聽聽聽聽聽聽涓嬮潰浠嬬粛鐨勬墍鏈変紭鍖栫畻娉曞熀鏈兘鑳藉鐢ㄨ繖涓祦绋?#xff0c;鍙槸寮忓瓙(4)鐨勫舰寮忎細鏈夊彉鍖栥€?/p>

涓€銆伮爐orch.optim.SGD 闅忔満姊害涓嬮檷

聽聽聽聽聽聽聽聽璇ョ被鍙疄鐜?SGD 浼樺寲绠楁硶,甯﹀姩閲?鐨凷GD 浼樺寲绠楁硶鍜屽甫 NAG(Nesterov accelerated聽gradient)鐨?SGD 浼樺寲绠楁硶,骞朵笖鍧囧彲鎷ユ湁 weight_decay(鏉冮噸琛板噺) 椤广€?/p>

SGD浠g爜

'''
params(iterable)- 鍙傛暟缁?#xff0c;浼樺寲鍣ㄨ浼樺寲鐨勯偅閮ㄥ垎鍙傛暟銆?lr(float)- 鍒濆瀛︿範鐜?#xff0c;鍙寜闇€闅忕潃璁粌杩囩▼涓嶆柇璋冩暣瀛︿範鐜囥€?momentum(float)- 鍔ㄩ噺,閫氬父璁剧疆涓?0.9,0.8
dampening(float)- dampening for momentum ,鏆傛椂涓嶄簡鍏跺姛鑳?#xff0c;鍦ㄦ簮鐮佷腑鏄繖鏍风敤鐨?#xff1a;buf.mul_(momentum).add_(1 - dampening, d_p),鍊煎緱娉ㄦ剰鐨勬槸,鑻ラ噰鐢╪esterov,dampening 蹇呴』涓?0.
weight_decay(float)- 鏉冨€艰“鍑忕郴鏁?#xff0c;涔熷氨鏄?L2 姝e垯椤圭殑绯绘暟
nesterov(bool)- bool 閫夐」,鏄惁浣跨敤 NAG(Nesterov accelerated gradient)
'''
class torch.optim.SGD(params, lr=<object object>, momentum=0, dampening=0, weight_decay=0, nesterov=False)

SGD绠楁硶瑙f瀽

1.MBGD(Mini-batch Gradient Descent)灏忔壒閲忔搴︿笅闄嶆硶

聽 聽 聽 聽 鏄庢槑绫诲悕鏄疭GD,涓轰粈涔堜粙缁峂BGD鍛?#xff0c;鍥犱负鍦≒ytorch涓?#xff0c;torch.optim.SGD鍏跺疄鏄疄鐜扮殑MBGD,瑕佹兂浣跨敤SGD,鍙灏哹atch_size璁炬垚1灏辫浜嗐€?/p>

聽聽聽聽聽聽聽聽MBGD灏辨槸缁撳悎BGD鍜孲GD鐨勬姌涓?#xff0c;瀵逛簬鍚湁 n涓缁冩牱鏈殑鏁版嵁闆?#xff0c;姣忔鍙傛暟鏇存柊,閫夋嫨涓€涓ぇ灏忎负 m(m<n)聽鐨刴ini-batch鏁版嵁鏍锋湰璁$畻鍏舵搴?#xff0c;鍏跺弬鏁版洿鏂板叕寮忓涓?鍏朵腑j鏄竴涓猙atch鐨勫紑濮?#xff1a;

\theta _{t+1}=\theta _{t}-\eta *\frac{1}{m}*\sum_{i=j}^{i=j+m-1}\bigtriangledown _{\theta _{i}}J_{i}(\theta _{t})聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽(6)

浼樼偣:浣跨敤mini-batch鐨勬椂鍊?#xff0c;鍙互鏀舵暃寰楀緢蹇?#xff0c;鏈変竴瀹氭憜鑴卞眬閮ㄦ渶浼樼殑鑳藉姏銆?/p>

缂虹偣:a.鍦ㄩ殢鏈洪€夋嫨姊害鐨勫悓鏃朵細寮曞叆鍣0,浣垮緱鏉冨€兼洿鏂扮殑鏂瑰悜涓嶄竴瀹氭纭?/p>

聽 聽 聽 聽 聽 聽b.涓嶈兘瑙e喅灞€閮ㄦ渶浼樿В鐨勯棶棰?/p>

聽2.Momentum鍔ㄩ噺

聽聽聽聽聽聽聽聽聽鍔ㄩ噺鏄竴绉嶆湁鍔╀簬鍦ㄧ浉鍏虫柟鍚戜笂鍔犻€烻GD骞舵姂鍒舵尟鑽$殑鏂规硶,閫氳繃灏嗗綋鍓嶆搴︿笌杩囧幓姊害鍔犳潈骞冲潎,鏉ヨ幏鍙栧嵆灏嗘洿鏂扮殑姊害銆傚涓嬪浘b鍥炬墍绀恒€傚畠閫氳繃灏嗚繃鍘绘椂闂存闀跨殑鏇存柊鍚戦噺鐨勪竴灏忛儴鍒嗘坊鍔犲埌褰撳墠鏇存柊鍚戦噺鏉ュ疄鐜拌繖涓€鐐?#xff1a;

image-20211126212003953

聽鍔ㄩ噺椤归€氬父璁剧疆涓?.9鎴栫被浼煎€笺€?/p>

鍙傛暟鏇存柊鍏紡濡備笅,鍏朵腑蟻 鏄姩閲忚“鍑忕巼,m鏄€熺巼(鍗充竴闃跺姩閲?#xff09;

g_{t}=\bigtriangledown_\theta J(\theta _{t})聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 聽 聽 聽(7)

m_{t} = \rho *m_{t-1} +g_{t}聽 聽 聽 聽 聽 聽 聽 聽 (8)

\theta _{t+1}=\theta _{t}-\eta *m_{t}聽 聽 聽 聽 聽 聽 聽 聽 聽 (9)

3.NAG(Nesterov accelerated聽gradient)

聽聽聽聽聽聽聽聽NAG鐨勬€濇兂鏄湪鍔ㄩ噺娉曠殑鍩虹涓婂睍寮€鐨勩€傚姩閲忔硶鏄€濇兂鏄?#xff0c;灏嗗綋鍓嶆搴︿笌杩囧幓姊害鍔犳潈骞冲潎,鏉ヨ幏鍙栧嵆灏嗘洿鏂扮殑姊害銆傚湪鐭ラ亾姊害涔嬪悗,鏇存柊鑷彉閲忓埌鏂扮殑浣嶇疆銆備篃灏辨槸璇存垜浠叾瀹炲湪姣忎竴姝?#xff0c;鏄煡閬撲笅涓€鏃跺埢浣嶇疆鐨勩€傝繖鏃禢esterov灏辫浜?#xff1a;閭f棦鐒惰繖鏍风殑璇?#xff0c;鎴戜滑浣曚笉鐩存帴閲囩敤涓嬩竴鏃跺埢鐨勬搴︽潵鍜屼笂涓€鏃跺埢姊害杩涜鍔犳潈骞冲潎鍛?#xff1f;涓嬮潰涓ゅ紶鍥剧湅鏄庣櫧,灏辩悊瑙AG浜?#xff1a;

聽聽聽聽聽聽聽聽

NAG鍜岀粡鍏稿姩閲忔硶鐨勫樊鍒氨鍦˙鐐瑰拰C鐐规搴︾殑涓嶅悓銆偮?/p>

聽鍙傛暟鏇存柊鍏紡:

g_{t}=\bigtriangledown_\theta J(\theta _{t}-\rho m_{t-1})聽 聽 聽 聽 聽 聽 聽 聽 (10)

m_{t} = \rho *m_{t-1} +g_{t}聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 (11)

\theta _{t+1}=\theta _{t}-\eta *m_{t}聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽(12)

聽 聽 聽 聽 涓婂紡涓殑-\rho m_{t-1}灏辨槸鍥句腑鐨凚鍒癈閭d竴娈靛悜閲?#xff0c;\theta _{t}-\rho m_{t-1}灏辨槸C鐐瑰潗鏍?#xff08;鍙傛暟)銆傚彲浠ョ湅鍒癗AG闄や簡寮忓瓙(10)涓庡紡瀛?#xff08;7)鏈夋墍涓嶅悓,鍏朵綑鍏紡鍜孧omentum鏄竴鏍风殑銆?/p>

聽聽聽聽聽聽聽聽涓€鑸儏鍐典笅NAG鏂规硶鐩告瘮Momentum鏀舵暃閫熷害蹇€佹尝鍔ㄤ篃灏忋€傚疄闄呬笂NAG鏂规硶鐢ㄥ埌浜嗕簩闃朵俊鎭?#xff0c;鎵€浠ユ墠浼氭湁杩欎箞濂界殑缁撴灉銆?/p>

聽聽聽聽聽聽聽聽聽Nesterov鍔ㄩ噺姊害鐨勮绠楀湪妯″瀷鍙傛暟鏂藉姞褰撳墠閫熷害涔嬪悗,鍥犳鍙互鐞嗚В涓哄線鏍囧噯鍔ㄩ噺涓坊鍔犱簡涓€涓牎姝e洜瀛愩€傚湪鍑告壒閲忔搴︾殑鎯呭喌涓?#xff0c;Nesterov鍔ㄩ噺灏嗛澶栬宸敹鏁涚巼浠?img alt=”O(\frac{1}{k})” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?%5Cdpi%7B100%7D%20O%28%5Cfrac%7B1%7D%7Bk%7D%29″ />(k姝ュ悗)鏀硅繘鍒奥犅?img alt=”O(\frac{1}{k^2})” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?%5Cdpi%7B100%7D%20O%28%5Cfrac%7B1%7D%7Bk%5E2%7D%29″ />,鐒惰€?#xff0c;鍦ㄩ殢鏈烘搴︽儏鍐典笅,Nesterov鍔ㄩ噺瀵规敹鏁涚巼鐨勪綔鐢ㄥ嵈涓嶆槸寰堝ぇ銆?/p>

SGD鎬荤粨

浣跨敤浜哅omentum鎴朜AG鐨凪BGD鏈夊涓嬬壒鐐?#xff1a;

浼樼偣:鍔犲揩鏀舵暃閫熷害,鏈変竴瀹氭憜鑴卞眬閮ㄦ渶浼樼殑鑳藉姏,涓€瀹氱▼搴︿笂缂撹В浜嗘病鏈夊姩閲忕殑鏃跺€欑殑闂

缂虹偣:a.浠嶇劧缁ф壙浜嗕竴閮ㄥ垎SGD鐨勭己鐐?/p>

聽 聽 聽 聽 聽 b.鍦ㄩ殢鏈烘搴︽儏鍐典笅,NAG瀵规敹鏁涚巼鐨勪綔鐢ㄤ笉鏄緢澶?/p>

聽 聽 聽 聽 聽 c.Momentum鍜孨AG閮芥槸涓轰簡浣挎搴︽洿鏂版洿鐏垫椿銆備絾鏄汉宸ヨ璁$殑瀛︿範鐜囨€绘槸鏈変簺鐢熺‖,涓嬮潰浠嬬粛鍑犵鑷€傚簲瀛︿範鐜囩殑鏂规硶銆?/p>

鎺ㄨ崘绋嬪害:甯omentum鐨則orch.optim.SGD 鍙互涓€璇曘€?/p>

浜屻€?span style=”color:#000000;”>torch.optim.ASGD闅忔満骞冲潎姊害涓嬮檷

聽聽聽聽聽聽聽聽ASGD 涔熺О涓?SAG,琛ㄧず闅忔満骞冲潎姊害涓嬮檷(Averaged Stochastic Gradient Descent),绠€鍗曞湴璇?ASGD 灏辨槸鐢ㄧ┖闂存崲鏃堕棿鐨勪竴绉?SGD,鍥犱负寰堝皯浣跨敤,鎵€浠ヤ笉璇︾粏浠嬬粛,璇︽儏鍙弬鐪嬭鏂?#xff1a; http://riejohnson.com/rie/stograd_nips.pdf

'''
params(iterable)- 鍙傛暟缁?浼樺寲鍣ㄨ浼樺寲鐨勯偅浜涘弬鏁般€?lr(float)- 鍒濆瀛︿範鐜?#xff0c;鍙寜闇€闅忕潃璁粌杩囩▼涓嶆柇璋冩暣瀛︿範鐜囥€?lambd(float)- 琛板噺椤?#xff0c;榛樿鍊?1e-4銆?alpha(float)- power for eta update ,榛樿鍊?0.75銆?t0(float)- point at which to start averaging,榛樿鍊?1e6銆?weight_decay(float)- 鏉冨€艰“鍑忕郴鏁?#xff0c;涔熷氨鏄?L2 姝e垯椤圭殑绯绘暟銆?'''
class torch.optim.ASGD(params, lr=0.01, lambd=0.0001, alpha=0.75, t0=1000000.0, weight_decay=0)

鎺ㄨ崘绋嬪害:涓嶅父瑙?/strong>

涓夈€?/strong>torch.optim.Rprop

聽聽聽聽聽聽聽聽璇ョ被瀹炵幇 Rprop 浼樺寲鏂规硶(寮规€у弽鍚戜紶鎾?,閫傜敤浜?full-batch,涓嶉€傜敤浜?mini-batch,鍥犺€屽湪 mini-batch 澶ц鍏堕亾鐨勬椂浠i噷,寰堝皯瑙佸埌銆?/p>

'''
params - 鍙傛暟缁?浼樺寲鍣ㄨ浼樺寲鐨勯偅浜涘弬鏁般€?lr - 瀛︿範鐜?etas (Tuple[float, float])- 涔樻硶澧炲噺鍥犲瓙
step_sizes (Tuple[float, float]) - 鍏佽鐨勬渶灏忓拰鏈€澶ф闀?'''
class torch.optim.Rprop(params, lr=0.01, etas=(0.5, 1.2), step_sizes=(1e-06, 50))

浼樼偣:瀹冨彲浠ヨ嚜鍔ㄨ皟鑺傚涔犵巼,涓嶉渶瑕佷汉涓鸿皟鑺?/p>

缂虹偣:浠嶄緷璧栦簬浜哄伐璁剧疆涓€涓叏灞€瀛︿範鐜?闅忕潃杩唬娆℃暟澧炲,瀛︿範鐜囦細瓒婃潵瓒婂皬,鏈€缁堜細瓒嬭繎浜?

鎺ㄨ崘绋嬪害:涓嶆帹鑽?/strong>

鍥涖€?span style=”color:#000000;”>torch.optim.Adagrad 鑷€傚簲姊害

聽聽聽聽聽聽聽聽璇ョ被鍙疄鐜?Adagrad 浼樺寲鏂规硶(Adaptive Gradient),Adagrad 鏄竴绉嶈嚜閫傚簲浼樺寲鏂规硶,鏄嚜閫傚簲鐨勪负鍚勪釜鍙傛暟鍒嗛厤涓嶅悓鐨勫涔犵巼銆傝繖涓涔犵巼鐨勫彉鍖?#xff0c;浼氬彈鍒版搴︾殑澶у皬鍜岃凯浠f鏁扮殑褰卞搷銆傛搴﹁秺澶?#xff0c;瀛︿範鐜囪秺灏?#xff1b;姊害瓒婂皬,瀛︿範鐜囪秺澶с€?/p>

Adagrad 浠g爜

'''
params (iterable) 鈥?寰呬紭鍖栧弬鏁扮殑iterable鎴栬€呮槸瀹氫箟浜嗗弬鏁扮粍鐨刣ict
lr (float, 鍙€? 鈥?瀛︿範鐜?#xff08;榛樿: 1e-2)
lr_decay (float, 鍙€? 鈥?瀛︿範鐜囪“鍑?#xff08;榛樿: 0)
weight_decay (float, 鍙€? 鈥?鏉冮噸琛板噺(L2鎯╃綒)(榛樿: 0)
initial_accumulator_value - 绱姞鍣ㄧ殑璧峰鍊?#xff0c;蹇呴』涓烘銆?
'''
class torch.optim.Adagrad(params, lr=0.01, lr_decay=0, weight_decay=0, initial_accumulator_value=0)

Adagrad 绠楁硶瑙f瀽

聽聽聽聽聽聽聽聽AdaGrad瀵瑰涔犵巼杩涜浜嗕竴涓害鏉?#xff0c;瀵逛簬缁忓父鏇存柊鐨勫弬鏁?#xff0c;鎴戜滑宸茬粡绉疮浜嗗ぇ閲忓叧浜庡畠鐨勭煡璇?#xff0c;涓嶅笇鏈涜鍗曚釜鏍锋湰褰卞搷澶ぇ,甯屾湜瀛︿範閫熺巼鎱竴浜?#xff1b;瀵逛簬鍋跺皵鏇存柊鐨勫弬鏁?#xff0c;鎴戜滑浜嗚В鐨勪俊鎭お灏?#xff0c;甯屾湜鑳戒粠姣忎釜鍋剁劧鍑虹幇鐨勬牱鏈韩涓婂瀛︿竴浜?#xff0c;鍗冲涔犻€熺巼澶т竴浜涖€傝繖鏍峰ぇ澶ф彁楂樻搴︿笅闄嶇殑椴佹鎬?strong>銆?/strong>鑰岃鏂规硶涓紑濮嬩娇鐢ㄤ簩闃跺姩閲?#xff0c;鎵嶆剰鍛崇潃鈥滆嚜閫傚簲瀛︿範鐜団€濅紭鍖栫畻娉曟椂浠g殑鍒版潵銆?br /> 聽聽聽聽聽聽聽聽鍦⊿GD涓?#xff0c;鎴戜滑姣忔杩唬瀵规墍鏈夊弬鏁拌繘琛屾洿鏂?#xff0c;鍥犱负姣忎釜鍙傛暟浣跨敤鐩稿悓鐨勫涔犵巼銆傝€孉daGrad鍦ㄦ瘡涓椂闂存闀垮姣忎釜鍙傛暟浣跨敤涓嶅悓鐨勫涔犵巼銆侫daGrad娑堥櫎浜嗘墜鍔ㄨ皟鏁村涔犵巼鐨勯渶瑕併€侫daGrad鍦ㄨ凯浠h繃绋嬩腑涓嶆柇璋冩暣瀛︿範鐜?#xff0c;骞惰鐩爣鍑芥暟涓殑姣忎釜鍙傛暟閮藉垎鍒嫢鏈夎嚜宸辩殑瀛︿範鐜囥€傚ぇ澶氭暟瀹炵幇浣跨敤瀛︿範鐜囬粯璁ゅ€间负0.01,寮€濮嬭缃竴涓緝澶х殑瀛︿範鐜囥€?/p>

聽聽聽聽聽聽聽聽AdaGrad寮曞叆浜嗕簩闃跺姩閲忋€備簩闃跺姩閲忔槸杩勪粖涓烘鎵€鏈夋搴﹀€肩殑骞虫柟鍜?#xff0c;鍗?img alt=”v_{t}=\sum_{i=1}^{t}g_{t}^{2}” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?%5Cdpi%7B100%7D%20v_%7Bt%7D%3D%5Csum_%7Bi%3D1%7D%5E%7Bt%7Dg_%7Bt%7D%5E%7B2%7D” />瀹冩槸鐢ㄦ潵搴﹂噺鍘嗗彶鏇存柊棰戠巼鐨勩€備篃灏辨槸璇?#xff0c;鎴戜滑鐨勫涔犵巼鐜板湪鏄?img alt=”\frac{\eta }{\sqrt{v_{t}+\epsilon }}” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?%5Cdpi%7B100%7D%20%5Cfrac%7B%5Ceta%20%7D%7B%5Csqrt%7Bv_%7Bt%7D&plus;%5Cepsilon%20%7D%7D” />,浠庤繖閲屾垜浠氨浼氬彂鐜奥?img alt=”\sqrt{v_{t}+\epsilon }” class=”mathcode” src=”https://latex.codecogs.com/gif.latex?%5Cdpi%7B100%7D%20%5Csqrt%7Bv_%7Bt%7D&plus;%5Cepsilon%20%7D” />鏄亽澶т簬0鐨?#xff0c;鑰屼笖鍙傛暟鏇存柊瓒婇绻?#xff0c;浜岄樁鍔ㄩ噺瓒婂ぇ,瀛︿範鐜囧氨瓒婂皬,杩欎竴鏂规硶鍦ㄧ█鐤忔暟鎹満鏅笅琛ㄧ幇闈炲父濂?#xff0c;鍙傛暟鏇存柊鍏紡濡備笅:聽

聽聽聽聽聽聽聽聽v_{t}=\sum_{i=1}^{t}g_{t}^{2}聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 聽 (13)

聽聽聽聽聽聽聽聽\theta _{t-1}=\theta _{t}-\eta *\frac{g_{t}}{\sqrt{v_{t}+\epsilon }}聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽(14)

AdaGrad鎬荤粨

聽聽聽聽聽聽聽聽AdaGrad鍦ㄦ瘡涓椂闂存闀垮姣忎釜鍙傛暟浣跨敤涓嶅悓鐨勫涔犵巼銆傚苟涓斿紩鍏ヤ簡浜岄樁鍔ㄩ噺,浜岄樁鍔ㄩ噺鏄縿浠婁负姝㈡墍鏈夋搴﹀€肩殑骞虫柟鍜屻€?/strong>

浼樼偣:AdaGrad娑堥櫎浜嗘墜鍔ㄨ皟鏁村涔犵巼鐨勯渶瑕併€侫daGrad鍦ㄨ凯浠h繃绋嬩腑涓嶆柇璋冩暣瀛︿範鐜?#xff0c;骞惰鐩爣鍑芥暟涓殑姣忎釜鍙傛暟閮藉垎鍒嫢鏈夎嚜宸辩殑瀛︿範鐜囥€?/p>

缂虹偣:a.浠嶉渶瑕佹墜宸ヨ缃竴涓叏灞€瀛︿範鐜嚶犅? 濡傛灉聽聽璁剧疆杩囧ぇ鐨勮瘽,浼氫娇regularizer杩囦簬鏁忔劅,瀵规搴︾殑璋冭妭澶ぇ

聽聽聽聽聽聽聽聽b.鍦ㄥ垎姣嶄腑绱Н骞虫柟姊害,鐢变簬姣忎釜娣诲姞椤归兘鏄鏁?#xff0c;鍥犳鍦ㄨ缁冭繃绋嬩腑绱Н鍜屼笉鏂闀裤€傝繖瀵艰嚧瀛︿範鐜囦笉鏂彉灏忓苟鏈€缁堝彉寰楁棤闄愬皬,姝ゆ椂绠楁硶涓嶅啀鑳藉鑾峰緱棰濆鐨勭煡璇嗗嵆瀵艰嚧妯″瀷涓嶄細鍐嶆瀛︿範銆?/p>

鎺ㄨ崘绋嬪害:涓嶆帹鑽?/strong>

鎺ヤ笅鏉dam鐩稿叧鐨勫皢鏄噸鐐?#xff0c;鏁鏈熷緟銆傘€傘€?/strong>

发表回复

您的电子邮箱地址不会被公开。 必填项已用*标注