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Differentiable function

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in the space of all continuous functions. Informally, this means that differentiable functions are very atypical among continuous functions. The first known example of a function that is continuous everywhere but differentiable nowhere is the
2659: 2027:{\displaystyle \lim _{\mathbf {h} \to \mathbf {0} }{\frac {\|\mathbf {f} (\mathbf {x_{0}} +\mathbf {h} )-\mathbf {f} (\mathbf {x_{0}} )-\mathbf {J} \mathbf {(h)} \|_{\mathbf {R} ^{n}}}{\|\mathbf {h} \|_{\mathbf {R} ^{m}}}}=0.} 1706: 366: 1185: 591: 916: 2261: 1064: 2774: 3125: 3016: 1423: 2142: 848: 2959: 2698: 2515: 1451:
Thus, this example shows the existence of a function that is differentiable but not continuously differentiable (i.e., the derivative is not a continuous function). Nevertheless,
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if its derivative is also a continuous function; there exist functions that are differentiable but not continuously differentiable (an example is given in the section
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Although this definition looks similar to the differentiability of single-variable real functions, it is however a more restrictive condition. A function
3311: 3905: 2477:, complex-differentiability is defined using the same definition as single-variable real functions. This is allowed by the possibility of dividing 1058: 1616: 276: 1332: 2435:{\displaystyle f(x,y)={\begin{cases}y^{3}/(x^{2}+y^{2})&{\text{if }}(x,y)\neq (0,0)\\0&{\text{if }}(x,y)=(0,0)\end{cases}}} 501: 3421: 853: 3304: 2255:, but all of the partial derivatives and directional derivatives exist at this point. For a continuous example, the function 2729: 1290:{\displaystyle f'(0)=\lim _{\varepsilon \to 0}\left({\frac {\varepsilon ^{2}\sin(1/\varepsilon )-0}{\varepsilon }}\right)=0} 4094: 3147: 3065: 73:
at each interior point in its domain. A differentiable function is smooth (the function is locally well approximated as a
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exists and is itself a continuous function. Although the derivative of a differentiable function never has a
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can be differentiable as a multi-variable function, while not being complex-differentiable. For example,
2241:{\displaystyle f(x,y)={\begin{cases}x&{\text{if }}y\neq x^{2}\\0&{\text{if }}y=x^{2}\end{cases}}} 2085: 2078: 406: 3799: 3734: 3335: 3231: 1456: 440: 658:
A continuous function is not necessarily differentiable, but a differentiable function is necessarily
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matrix in this case. A similar formulation of the higher-dimensional derivative is provided by the
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on the graph of a continuous function. At zero, the function is continuous but not differentiable.
4144: 4129: 3782: 3777: 3677: 3545: 3157: 1020: 4104: 3864: 3583: 3578: 3226: 2453: 2119: 762:. In particular, any differentiable function must be continuous at every point in its domain. 116: 51: 3024: 1300: 4134: 4119: 4084: 3772: 3672: 3540: 2122:) does not guarantee that a function is differentiable at a point. For example, the function 1711: 1428: 1326: 921: 4002: 2654:{\displaystyle f'(a)=\lim _{\underset {h\in \mathbb {C} }{h\to 0}}{\frac {f(a+h)-f(a)}{h}}.} 1471: 947: 472: 4154: 4109: 3555: 3500: 3346: 3341: 3131: 3019: 2468: 1568: 1563:
of the function both exist and are continuous. More generally, a function is said to be of
1534: 1504: 791: 228: 59: 8: 3729: 3707: 3456: 3451: 3409: 3361: 1463: 766:: a continuous function need not be differentiable. For example, a function with a bend, 750: 683: 659: 597: 63: 4114: 3692: 3257: 3200:
if it is differentiable with respect to some (or any) coordinate charts defined around
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if it is differentiable with respect to some (or any) coordinate chart defined around
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at that point. Such a function is necessarily infinitely differentiable, and in fact
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Any function that is complex-differentiable in a neighborhood of a point is called
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may be continuous, but fails to be differentiable at the location of the anomaly.
4038: 3982: 3804: 3446: 3366: 2066: 1765: 662:(at every point where it is differentiable) as being shown below (in the section 74: 200:
if its derivative is also a continuous function over the domain of the function
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function is continuous (i.e. it has no gaps). It is differentiable everywhere
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is differentiable. However, this function is not continuously differentiable.
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implies that the derivative of any function satisfies the conclusion of the
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states that the set of functions that have a derivative at some point is a
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Most functions that occur in practice have derivatives at all points or at
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is automatically differentiable at that point, when viewed as a function
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Differentiable functions can be locally approximated by linear functions.
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However, the existence of the partial derivatives (or even of all the
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continuously differentiable functions are sometimes said to be of
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at each interior point) and does not contain any break, angle, or
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does not exist (e.g., it depends on the angle of approach).
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is differentiable at every point, viewed as the 2-variable
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exist and are continuous over the domain of the function
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Smoothness § Multivariate differentiability classes
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If all the partial derivatives of a function exist in a
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Differentiable manifold § Differentiable functions
3068: 2931: 2769:{\displaystyle f:\mathbb {R} ^{2}\to \mathbb {R} ^{2}} 2706: 2670: 2523: 2487: 1747: 1650: 1619: 1023: 995: 893: 443: 374: 310: 279: 206: 3277: 3120:{\textstyle \lim _{h\to 0}{\frac {h+{\bar {h}}}{2h}}} 3027: 2967: 2785: 2732: 2552: 2264: 2145: 1864: 1776: 1714: 1599: 1571: 1537: 1507: 1474: 1431: 1335: 1303: 1188: 1067: 950: 924: 856: 820: 663: 637: 504: 475: 409: 259: 231: 119: 2106:, then the function is differentiable at that point 3011:{\displaystyle f(z)={\frac {z+{\overline {z}}}{2}}} 706:= 0, where it makes a sharp turn as it crosses the 677: 399:
Differentiability of real functions of one variable
3119: 3054: 3010: 2953: 2914: 2768: 2718: 2692: 2653: 2535: 2509: 2434: 2240: 2026: 1792: 1756: 1733: 1700: 1605: 1584: 1550: 1520: 1490: 1443: 1417: 1318: 1289: 1174: 1045: 1001: 971: 936: 910: 842: 648: 585: 487: 457: 429: 380: 360: 265: 244: 212: 146: 1963: 1957: 93:is an interior point in the domain of a function 4215: 3070: 2787: 2574: 1866: 1210: 526: 1057:, it is possible for the derivative to have an 1418:{\displaystyle f'(x)=2x\sin(1/x)-\cos(1/x)\;,} 843:{\displaystyle f:\mathbb {R} \to \mathbb {R} } 671: 3305: 1708:all exist and are continuous. If derivatives 158:has a non-vertical tangent line at the point 27:Mathematical function whose derivative exists 3319: 2700:, that is complex-differentiable at a point 1997: 1988: 1968: 1888: 797: 2954:{\textstyle f:\mathbb {C} \to \mathbb {C} } 2693:{\textstyle f:\mathbb {C} \to \mathbb {C} } 2510:{\textstyle f:\mathbb {C} \to \mathbb {C} } 3312: 3298: 1411: 1084: 1080: 619:if it is differentiable at every point of 596:exists. This implies that the function is 188:if it is differentiable at every point of 3269: 3184:are differentiable manifolds, a function 2947: 2939: 2811: 2756: 2741: 2686: 2678: 2598: 2503: 2495: 836: 828: 639: 451: 423: 3196:is said to be differentiable at a point 3168:is said to be differentiable at a point 1825:is said to be differentiable at a point 809: 801: 715: 687: 29: 391:For a multivariable function, as shown 66:of a differentiable function has a non- 14: 4216: 3250: 1804:Differentiability in higher dimensions 3293: 3142:Differentiable functions on manifolds 2463:Differentiability in complex analysis 154:exists. In other words, the graph of 4150:Generative adversarial network (GAN) 3160:, a real or complex-valued function 2081:found in single-variable calculus. 2037:If a function is differentiable at 430:{\displaystyle f:U\to \mathbb {R} } 24: 1810:function of several real variables 1782: 1647: 1625: 1029: 623:. In this case, the derivative of 458:{\textstyle U\subset \mathbb {R} } 307: 285: 25: 4245: 3222:Generalizations of the derivative 4188: 4187: 4167: 3282:. Springer-Verlag. Theorem 17.8. 3278:Hewitt, E; Stromberg, K (1963). 2517:is said to be differentiable at 2097:and are continuous at the point 2003: 1992: 1974: 1960: 1952: 1939: 1935: 1926: 1915: 1905: 1901: 1892: 1879: 1871: 1741:exist for all positive integers 678:Differentiability and continuity 664:Differentiability and continuity 184:is said to be differentiable on 4100:Recurrent neural network (RNN) 4090:Differentiable neural computer 3244: 3100: 3077: 3043: 3031: 2977: 2971: 2943: 2899: 2891: 2884: 2877: 2871: 2857: 2851: 2842: 2830: 2823: 2796: 2751: 2682: 2639: 2633: 2624: 2612: 2583: 2567: 2561: 2499: 2422: 2410: 2404: 2392: 2375: 2363: 2357: 2345: 2335: 2309: 2280: 2268: 2161: 2149: 1945: 1930: 1919: 1896: 1875: 1726: 1720: 1695: 1689: 1684: 1678: 1661: 1655: 1636: 1630: 1435: 1408: 1394: 1382: 1368: 1350: 1344: 1262: 1248: 1217: 1203: 1197: 1182:is differentiable at 0, since 1123: 1109: 1077: 1071: 1040: 1034: 960: 954: 866: 860: 832: 574: 568: 559: 547: 533: 519: 513: 419: 355: 349: 344: 338: 321: 315: 296: 290: 141: 128: 13: 1: 4145:Variational autoencoder (VAE) 4105:Long short-term memory (LSTM) 3372:Computational learning theory 3237: 734:is differentiable at a point 649:{\displaystyle \mathbb {R} .} 4125:Convolutional neural network 2997: 1793:{\displaystyle C^{\infty }.} 1061:. For example, the function 781:point. However, a result of 666:). A function is said to be 58:exists at each point in its 7: 4120:Multilayer perceptron (MLP) 3215: 2079:fundamental increment lemma 1046:{\textstyle f^{\prime }(x)} 1013:continuously differentiable 668:continuously differentiable 198:continuously differentiable 10: 4250: 4196:Artificial neural networks 4110:Gated recurrent unit (GRU) 3336:Differentiable programming 3280:Real and abstract analysis 3232:Differentiable programming 3145: 2466: 2451: 1457:intermediate value theorem 982: 764:The converse does not hold 681: 4163: 4077: 4021: 3950: 3883: 3755: 3655: 3648: 3602: 3566: 3529:Artificial neural network 3509: 3385: 3352:Automatic differentiation 3325: 2445:is not differentiable at 2251:is not differentiable at 798:Differentiability classes 672:Differentiability classes 437:, defined on an open set 147:{\displaystyle f'(x_{0})} 34:A differentiable function 3357:Neuromorphic engineering 3320:Differentiable computing 3055:{\displaystyle f(x,y)=x} 1319:{\displaystyle x\neq 0,} 627:is thus a function from 4130:Residual neural network 3546:Artificial Intelligence 3158:differentiable manifold 2120:directional derivatives 1734:{\displaystyle f^{(n)}} 1444:{\displaystyle x\to 0.} 1059:essential discontinuity 937:{\displaystyle x\neq 0} 224:is said to be of class 44:differentiable function 4229:Multivariable calculus 3271:10.4064/sm-3-1-174-179 3227:Semi-differentiability 3121: 3056: 3012: 2955: 2916: 2770: 2720: 2694: 2655: 2537: 2511: 2454:Multivariable calculus 2436: 2242: 2028: 1794: 1758: 1735: 1702: 1607: 1586: 1552: 1522: 1492: 1491:{\displaystyle C^{0},} 1445: 1425:which has no limit as 1419: 1320: 1291: 1176: 1047: 1003: 980: 973: 972:{\displaystyle f(0)=0} 938: 912: 844: 807: 725: 713: 650: 587: 489: 488:{\displaystyle a\in U} 459: 431: 382: 362: 267: 246: 220:. Generally speaking, 214: 148: 62:. In other words, the 35: 4224:Differential calculus 4085:Neural Turing machine 3673:Human image synthesis 3122: 3057: 3013: 2956: 2917: 2771: 2721: 2695: 2656: 2538: 2512: 2437: 2243: 2059:, and the linear map 2029: 1795: 1759: 1736: 1703: 1608: 1587: 1585:{\displaystyle C^{k}} 1553: 1551:{\displaystyle C^{2}} 1523: 1521:{\displaystyle C^{1}} 1493: 1446: 1420: 1327:differentiation rules 1321: 1297:exists. However, for 1292: 1177: 1048: 1004: 974: 939: 913: 845: 813: 805: 719: 691: 651: 588: 490: 460: 432: 383: 363: 268: 247: 245:{\displaystyle C^{k}} 215: 149: 33: 4176:Computer programming 4155:Graph neural network 3730:Text-to-video models 3708:Text-to-image models 3556:Large language model 3541:Scientific computing 3347:Statistical manifold 3342:Information geometry 3066: 3025: 2965: 2929: 2925:However, a function 2783: 2730: 2704: 2668: 2550: 2521: 2485: 2469:Holomorphic function 2262: 2143: 1862: 1774: 1768:or equivalently, of 1745: 1712: 1617: 1597: 1569: 1535: 1505: 1472: 1464:continuous functions 1429: 1333: 1301: 1186: 1065: 1021: 993: 948: 922: 854: 818: 792:Weierstrass function 635: 502: 473: 441: 407: 372: 277: 257: 229: 204: 117: 3522:In-context learning 3362:Pattern recognition 3251:Banach, S. (1931). 2048:partial derivatives 1529:. A function is of 684:Continuous function 4115:Echo state network 4003:Jürgen Schmidhuber 3698:Facial recognition 3693:Speech recognition 3603:Software libraries 3117: 3084: 3052: 3008: 2951: 2912: 2818: 2816: 2766: 2716: 2690: 2651: 2605: 2603: 2533: 2507: 2432: 2427: 2238: 2233: 2046:, then all of the 2024: 1884: 1790: 1754: 1731: 1698: 1603: 1582: 1548: 1518: 1488: 1466:are said to be of 1441: 1415: 1316: 1287: 1224: 1172: 1167: 1055:jump discontinuity 1043: 1017:if the derivative 999: 981: 969: 934: 908: 902: 840: 808: 726: 714: 646: 583: 540: 495:if the derivative 485: 455: 427: 378: 358: 263: 242: 210: 144: 113:if the derivative 36: 4211: 4210: 3973:Stephen Grossberg 3946: 3945: 3115: 3103: 3069: 3006: 3000: 2904: 2791: 2786: 2646: 2578: 2573: 2481:. So, a function 2390: 2343: 2213: 2183: 2016: 1865: 1606:{\displaystyle k} 1561:second derivative 1559:if the first and 1462:Similarly to how 1453:Darboux's theorem 1275: 1209: 1154: 1131: 901: 581: 525: 266:{\displaystyle k} 103:differentiable at 18:Differentiability 16:(Redirected from 4241: 4234:Smooth functions 4201:Machine learning 4191: 4190: 4171: 3926:Action selection 3916:Self-driving car 3723:Stable Diffusion 3688:Speech synthesis 3653: 3652: 3517:Machine learning 3393:Gradient descent 3314: 3307: 3300: 3291: 3290: 3284: 3283: 3275: 3273: 3248: 3126: 3124: 3123: 3118: 3116: 3114: 3106: 3105: 3104: 3096: 3086: 3083: 3061: 3059: 3058: 3053: 3017: 3015: 3014: 3009: 3007: 3002: 3001: 2993: 2984: 2960: 2958: 2957: 2952: 2950: 2942: 2921: 2919: 2918: 2913: 2905: 2903: 2902: 2894: 2888: 2887: 2870: 2826: 2820: 2817: 2815: 2814: 2802: 2775: 2773: 2772: 2767: 2765: 2764: 2759: 2750: 2749: 2744: 2725: 2723: 2722: 2719:{\textstyle x=a} 2717: 2699: 2697: 2696: 2691: 2689: 2681: 2660: 2658: 2657: 2652: 2647: 2642: 2607: 2604: 2602: 2601: 2589: 2560: 2542: 2540: 2539: 2536:{\textstyle x=a} 2534: 2516: 2514: 2513: 2508: 2506: 2498: 2475:complex analysis 2448: 2441: 2439: 2438: 2433: 2431: 2430: 2391: 2388: 2344: 2341: 2334: 2333: 2321: 2320: 2308: 2303: 2302: 2254: 2247: 2245: 2244: 2239: 2237: 2236: 2230: 2229: 2214: 2211: 2200: 2199: 2184: 2181: 2135: 2114: 2105: 2096: 2065:is given by the 2064: 2058: 2045: 2033: 2031: 2030: 2025: 2017: 2015: 2014: 2013: 2012: 2011: 2006: 1995: 1986: 1985: 1984: 1983: 1982: 1977: 1966: 1955: 1944: 1943: 1942: 1929: 1918: 1910: 1909: 1908: 1895: 1886: 1883: 1882: 1874: 1854: 1833: 1824: 1799: 1797: 1796: 1791: 1786: 1785: 1764:the function is 1763: 1761: 1760: 1755: 1740: 1738: 1737: 1732: 1730: 1729: 1707: 1705: 1704: 1699: 1688: 1687: 1654: 1653: 1629: 1628: 1612: 1610: 1609: 1604: 1591: 1589: 1588: 1583: 1581: 1580: 1557: 1555: 1554: 1549: 1547: 1546: 1527: 1525: 1524: 1519: 1517: 1516: 1497: 1495: 1494: 1489: 1484: 1483: 1450: 1448: 1447: 1442: 1424: 1422: 1421: 1416: 1404: 1378: 1343: 1325: 1323: 1322: 1317: 1296: 1294: 1293: 1288: 1280: 1276: 1271: 1258: 1241: 1240: 1230: 1223: 1196: 1181: 1179: 1178: 1173: 1171: 1170: 1155: 1152: 1132: 1129: 1119: 1102: 1101: 1052: 1050: 1049: 1044: 1033: 1032: 1015: 1014: 1008: 1006: 1005: 1000: 978: 976: 975: 970: 943: 941: 940: 935: 917: 915: 914: 909: 907: 903: 894: 881: 880: 849: 847: 846: 841: 839: 831: 772:vertical tangent 761: 748: 742: 733: 711: 705: 655: 653: 652: 647: 642: 630: 626: 622: 618: 610: 603: 592: 590: 589: 584: 582: 577: 542: 539: 512: 494: 492: 491: 486: 465:, is said to be 464: 462: 461: 456: 454: 436: 434: 433: 428: 426: 387: 385: 384: 379: 367: 365: 364: 359: 348: 347: 314: 313: 289: 288: 272: 270: 269: 264: 251: 249: 248: 243: 241: 240: 223: 219: 217: 216: 211: 195: 191: 187: 183: 179: 157: 153: 151: 150: 145: 140: 139: 127: 112: 100: 96: 92: 21: 4249: 4248: 4244: 4243: 4242: 4240: 4239: 4238: 4214: 4213: 4212: 4207: 4159: 4073: 4039:Google DeepMind 4017: 3983:Geoffrey Hinton 3942: 3879: 3805:Project Debater 3751: 3649:Implementations 3644: 3598: 3562: 3505: 3447:Backpropagation 3381: 3367:Tensor calculus 3321: 3318: 3288: 3287: 3249: 3245: 3240: 3218: 3150: 3144: 3107: 3095: 3094: 3087: 3085: 3073: 3067: 3064: 3063: 3026: 3023: 3022: 2992: 2985: 2983: 2966: 2963: 2962: 2946: 2938: 2930: 2927: 2926: 2898: 2890: 2889: 2883: 2863: 2822: 2821: 2819: 2810: 2803: 2792: 2790: 2784: 2781: 2780: 2760: 2755: 2754: 2745: 2740: 2739: 2731: 2728: 2727: 2705: 2702: 2701: 2685: 2677: 2669: 2666: 2665: 2608: 2606: 2597: 2590: 2579: 2577: 2553: 2551: 2548: 2547: 2522: 2519: 2518: 2502: 2494: 2486: 2483: 2482: 2479:complex numbers 2471: 2465: 2460: 2446: 2426: 2425: 2387: 2385: 2379: 2378: 2340: 2338: 2329: 2325: 2316: 2312: 2304: 2298: 2294: 2287: 2286: 2263: 2260: 2259: 2252: 2232: 2231: 2225: 2221: 2210: 2208: 2202: 2201: 2195: 2191: 2180: 2178: 2168: 2167: 2144: 2141: 2140: 2123: 2113: 2107: 2104: 2098: 2095: 2089: 2067:Jacobian matrix 2060: 2057: 2051: 2044: 2038: 2007: 2002: 2001: 2000: 1996: 1991: 1987: 1978: 1973: 1972: 1971: 1967: 1956: 1951: 1938: 1934: 1933: 1925: 1914: 1904: 1900: 1899: 1891: 1887: 1885: 1878: 1870: 1869: 1863: 1860: 1859: 1842: 1832: 1826: 1812: 1806: 1781: 1777: 1775: 1772: 1771: 1757:{\textstyle n,} 1746: 1743: 1742: 1719: 1715: 1713: 1710: 1709: 1677: 1673: 1646: 1642: 1624: 1620: 1618: 1615: 1614: 1598: 1595: 1594: 1576: 1572: 1570: 1567: 1566: 1542: 1538: 1536: 1533: 1532: 1512: 1508: 1506: 1503: 1502: 1479: 1475: 1473: 1470: 1469: 1430: 1427: 1426: 1400: 1374: 1336: 1334: 1331: 1330: 1302: 1299: 1298: 1254: 1236: 1232: 1231: 1229: 1225: 1213: 1189: 1187: 1184: 1183: 1166: 1165: 1151: 1149: 1143: 1142: 1128: 1126: 1115: 1097: 1093: 1086: 1085: 1066: 1063: 1062: 1028: 1024: 1022: 1019: 1018: 1012: 1011: 994: 991: 990: 987: 949: 946: 945: 923: 920: 919: 892: 888: 876: 872: 855: 852: 851: 835: 827: 819: 816: 815: 800: 760: 754: 744: 741: 735: 729: 707: 701: 686: 680: 638: 636: 633: 632: 628: 624: 620: 616: 608: 601: 543: 541: 529: 505: 503: 500: 499: 474: 471: 470: 450: 442: 439: 438: 422: 408: 405: 404: 401: 373: 370: 369: 337: 333: 306: 302: 284: 280: 278: 275: 274: 258: 255: 254: 236: 232: 230: 227: 226: 221: 205: 202: 201: 193: 189: 185: 181: 177: 166: 159: 155: 135: 131: 120: 118: 115: 114: 111: 105: 98: 94: 91: 85: 75:linear function 28: 23: 22: 15: 12: 11: 5: 4247: 4237: 4236: 4231: 4226: 4209: 4208: 4206: 4205: 4204: 4203: 4198: 4185: 4184: 4183: 4178: 4164: 4161: 4160: 4158: 4157: 4152: 4147: 4142: 4137: 4132: 4127: 4122: 4117: 4112: 4107: 4102: 4097: 4092: 4087: 4081: 4079: 4075: 4074: 4072: 4071: 4066: 4061: 4056: 4051: 4046: 4041: 4036: 4031: 4025: 4023: 4019: 4018: 4016: 4015: 4013:Ilya Sutskever 4010: 4005: 4000: 3995: 3990: 3985: 3980: 3978:Demis Hassabis 3975: 3970: 3968:Ian Goodfellow 3965: 3960: 3954: 3952: 3948: 3947: 3944: 3943: 3941: 3940: 3935: 3934: 3933: 3923: 3918: 3913: 3908: 3903: 3898: 3893: 3887: 3885: 3881: 3880: 3878: 3877: 3872: 3867: 3862: 3857: 3852: 3847: 3842: 3837: 3832: 3827: 3822: 3817: 3812: 3807: 3802: 3797: 3796: 3795: 3785: 3780: 3775: 3770: 3765: 3759: 3757: 3753: 3752: 3750: 3749: 3744: 3743: 3742: 3737: 3727: 3726: 3725: 3720: 3715: 3705: 3700: 3695: 3690: 3685: 3680: 3675: 3670: 3665: 3659: 3657: 3650: 3646: 3645: 3643: 3642: 3637: 3632: 3627: 3622: 3617: 3612: 3606: 3604: 3600: 3599: 3597: 3596: 3591: 3586: 3581: 3576: 3570: 3568: 3564: 3563: 3561: 3560: 3559: 3558: 3551:Language model 3548: 3543: 3538: 3537: 3536: 3526: 3525: 3524: 3513: 3511: 3507: 3506: 3504: 3503: 3501:Autoregression 3498: 3493: 3492: 3491: 3481: 3479:Regularization 3476: 3475: 3474: 3469: 3464: 3454: 3449: 3444: 3442:Loss functions 3439: 3434: 3429: 3424: 3419: 3418: 3417: 3407: 3402: 3401: 3400: 3389: 3387: 3383: 3382: 3380: 3379: 3377:Inductive bias 3374: 3369: 3364: 3359: 3354: 3349: 3344: 3339: 3331: 3329: 3323: 3322: 3317: 3316: 3309: 3302: 3294: 3286: 3285: 3264:(1): 174–179. 3242: 3241: 3239: 3236: 3235: 3234: 3229: 3224: 3217: 3214: 3143: 3140: 3113: 3110: 3102: 3099: 3093: 3090: 3082: 3079: 3076: 3072: 3051: 3048: 3045: 3042: 3039: 3036: 3033: 3030: 3005: 2999: 2996: 2991: 2988: 2982: 2979: 2976: 2973: 2970: 2949: 2945: 2941: 2937: 2934: 2923: 2922: 2911: 2908: 2901: 2897: 2893: 2886: 2882: 2879: 2876: 2873: 2869: 2866: 2862: 2859: 2856: 2853: 2850: 2847: 2844: 2841: 2838: 2835: 2832: 2829: 2825: 2813: 2809: 2806: 2801: 2798: 2795: 2789: 2763: 2758: 2753: 2748: 2743: 2738: 2735: 2715: 2712: 2709: 2688: 2684: 2680: 2676: 2673: 2662: 2661: 2650: 2645: 2641: 2638: 2635: 2632: 2629: 2626: 2623: 2620: 2617: 2614: 2611: 2600: 2596: 2593: 2588: 2585: 2582: 2576: 2572: 2569: 2566: 2563: 2559: 2556: 2532: 2529: 2526: 2505: 2501: 2497: 2493: 2490: 2467:Main article: 2464: 2461: 2443: 2442: 2429: 2424: 2421: 2418: 2415: 2412: 2409: 2406: 2403: 2400: 2397: 2394: 2386: 2384: 2381: 2380: 2377: 2374: 2371: 2368: 2365: 2362: 2359: 2356: 2353: 2350: 2347: 2339: 2337: 2332: 2328: 2324: 2319: 2315: 2311: 2307: 2301: 2297: 2293: 2292: 2290: 2285: 2282: 2279: 2276: 2273: 2270: 2267: 2249: 2248: 2235: 2228: 2224: 2220: 2217: 2209: 2207: 2204: 2203: 2198: 2194: 2190: 2187: 2179: 2177: 2174: 2173: 2171: 2166: 2163: 2160: 2157: 2154: 2151: 2148: 2111: 2102: 2093: 2055: 2042: 2035: 2034: 2023: 2020: 2010: 2005: 1999: 1994: 1990: 1981: 1976: 1970: 1965: 1962: 1959: 1954: 1950: 1947: 1941: 1937: 1932: 1928: 1924: 1921: 1917: 1913: 1907: 1903: 1898: 1894: 1890: 1881: 1877: 1873: 1868: 1830: 1805: 1802: 1800: 1789: 1784: 1780: 1753: 1750: 1728: 1725: 1722: 1718: 1697: 1694: 1691: 1686: 1683: 1680: 1676: 1672: 1669: 1666: 1663: 1660: 1657: 1652: 1649: 1645: 1641: 1638: 1635: 1632: 1627: 1623: 1602: 1592: 1579: 1575: 1558: 1545: 1541: 1528: 1515: 1511: 1498: 1487: 1482: 1478: 1440: 1437: 1434: 1414: 1410: 1407: 1403: 1399: 1396: 1393: 1390: 1387: 1384: 1381: 1377: 1373: 1370: 1367: 1364: 1361: 1358: 1355: 1352: 1349: 1346: 1342: 1339: 1315: 1312: 1309: 1306: 1286: 1283: 1279: 1274: 1270: 1267: 1264: 1261: 1257: 1253: 1250: 1247: 1244: 1239: 1235: 1228: 1222: 1219: 1216: 1212: 1208: 1205: 1202: 1199: 1195: 1192: 1169: 1164: 1161: 1158: 1153: if  1150: 1148: 1145: 1144: 1141: 1138: 1135: 1130: if  1127: 1125: 1122: 1118: 1114: 1111: 1108: 1105: 1100: 1096: 1092: 1091: 1089: 1083: 1079: 1076: 1073: 1070: 1042: 1039: 1036: 1031: 1027: 1016: 1009:is said to be 1002:{\textstyle f} 998: 983:Main article: 968: 965: 962: 959: 956: 953: 933: 930: 927: 906: 900: 897: 891: 887: 884: 879: 875: 871: 868: 865: 862: 859: 838: 834: 830: 826: 823: 799: 796: 758: 739: 694:absolute value 679: 676: 645: 641: 613:differentiable 611:is said to be 607:This function 594: 593: 580: 576: 573: 570: 567: 564: 561: 558: 555: 552: 549: 546: 538: 535: 532: 528: 524: 521: 518: 515: 511: 508: 484: 481: 478: 467:differentiable 453: 449: 446: 425: 421: 418: 415: 412: 400: 397: 381:{\textstyle f} 377: 357: 354: 351: 346: 343: 340: 336: 332: 329: 326: 323: 320: 317: 312: 309: 305: 301: 298: 295: 292: 287: 283: 262: 252: 239: 235: 213:{\textstyle f} 209: 196:is said to be 175: 164: 143: 138: 134: 130: 126: 123: 109: 101:is said to be 89: 50:variable is a 26: 9: 6: 4: 3: 2: 4246: 4235: 4232: 4230: 4227: 4225: 4222: 4221: 4219: 4202: 4199: 4197: 4194: 4193: 4186: 4182: 4179: 4177: 4174: 4173: 4170: 4166: 4165: 4162: 4156: 4153: 4151: 4148: 4146: 4143: 4141: 4138: 4136: 4133: 4131: 4128: 4126: 4123: 4121: 4118: 4116: 4113: 4111: 4108: 4106: 4103: 4101: 4098: 4096: 4093: 4091: 4088: 4086: 4083: 4082: 4080: 4078:Architectures 4076: 4070: 4067: 4065: 4062: 4060: 4057: 4055: 4052: 4050: 4047: 4045: 4042: 4040: 4037: 4035: 4032: 4030: 4027: 4026: 4024: 4022:Organizations 4020: 4014: 4011: 4009: 4006: 4004: 4001: 3999: 3996: 3994: 3991: 3989: 3986: 3984: 3981: 3979: 3976: 3974: 3971: 3969: 3966: 3964: 3961: 3959: 3958:Yoshua Bengio 3956: 3955: 3953: 3949: 3939: 3938:Robot control 3936: 3932: 3929: 3928: 3927: 3924: 3922: 3919: 3917: 3914: 3912: 3909: 3907: 3904: 3902: 3899: 3897: 3894: 3892: 3889: 3888: 3886: 3882: 3876: 3873: 3871: 3868: 3866: 3863: 3861: 3858: 3856: 3855:Chinchilla AI 3853: 3851: 3848: 3846: 3843: 3841: 3838: 3836: 3833: 3831: 3828: 3826: 3823: 3821: 3818: 3816: 3813: 3811: 3808: 3806: 3803: 3801: 3798: 3794: 3791: 3790: 3789: 3786: 3784: 3781: 3779: 3776: 3774: 3771: 3769: 3766: 3764: 3761: 3760: 3758: 3754: 3748: 3745: 3741: 3738: 3736: 3733: 3732: 3731: 3728: 3724: 3721: 3719: 3716: 3714: 3711: 3710: 3709: 3706: 3704: 3701: 3699: 3696: 3694: 3691: 3689: 3686: 3684: 3681: 3679: 3676: 3674: 3671: 3669: 3666: 3664: 3661: 3660: 3658: 3654: 3651: 3647: 3641: 3638: 3636: 3633: 3631: 3628: 3626: 3623: 3621: 3618: 3616: 3613: 3611: 3608: 3607: 3605: 3601: 3595: 3592: 3590: 3587: 3585: 3582: 3580: 3577: 3575: 3572: 3571: 3569: 3565: 3557: 3554: 3553: 3552: 3549: 3547: 3544: 3542: 3539: 3535: 3534:Deep learning 3532: 3531: 3530: 3527: 3523: 3520: 3519: 3518: 3515: 3514: 3512: 3508: 3502: 3499: 3497: 3494: 3490: 3487: 3486: 3485: 3482: 3480: 3477: 3473: 3470: 3468: 3465: 3463: 3460: 3459: 3458: 3455: 3453: 3450: 3448: 3445: 3443: 3440: 3438: 3435: 3433: 3430: 3428: 3425: 3423: 3422:Hallucination 3420: 3416: 3413: 3412: 3411: 3408: 3406: 3403: 3399: 3396: 3395: 3394: 3391: 3390: 3388: 3384: 3378: 3375: 3373: 3370: 3368: 3365: 3363: 3360: 3358: 3355: 3353: 3350: 3348: 3345: 3343: 3340: 3338: 3337: 3333: 3332: 3330: 3328: 3324: 3315: 3310: 3308: 3303: 3301: 3296: 3295: 3292: 3281: 3272: 3267: 3263: 3260: 3259: 3254: 3247: 3243: 3233: 3230: 3228: 3225: 3223: 3220: 3219: 3213: 3211: 3207: 3203: 3199: 3195: 3192: →  3191: 3187: 3183: 3179: 3175: 3171: 3167: 3163: 3159: 3155: 3149: 3139: 3137: 3133: 3128: 3111: 3108: 3097: 3091: 3088: 3080: 3074: 3049: 3046: 3040: 3037: 3034: 3028: 3021: 3020:real function 3003: 2994: 2989: 2986: 2980: 2974: 2968: 2935: 2932: 2909: 2906: 2895: 2880: 2874: 2867: 2864: 2860: 2854: 2848: 2845: 2839: 2836: 2833: 2827: 2807: 2804: 2799: 2793: 2779: 2778: 2777: 2761: 2746: 2736: 2733: 2713: 2710: 2707: 2674: 2671: 2648: 2643: 2636: 2630: 2627: 2621: 2618: 2615: 2609: 2594: 2591: 2586: 2580: 2570: 2564: 2557: 2554: 2546: 2545: 2544: 2530: 2527: 2524: 2491: 2488: 2480: 2476: 2470: 2459: 2455: 2450: 2419: 2416: 2413: 2407: 2401: 2398: 2395: 2382: 2372: 2369: 2366: 2360: 2354: 2351: 2348: 2330: 2326: 2322: 2317: 2313: 2305: 2299: 2295: 2288: 2283: 2277: 2274: 2271: 2265: 2258: 2257: 2256: 2226: 2222: 2218: 2215: 2205: 2196: 2192: 2188: 2185: 2175: 2169: 2164: 2158: 2155: 2152: 2146: 2139: 2138: 2137: 2134: 2130: 2126: 2121: 2116: 2110: 2101: 2092: 2087: 2082: 2080: 2076: 2072: 2068: 2063: 2054: 2049: 2041: 2021: 2018: 2008: 1979: 1948: 1922: 1911: 1858: 1857: 1856: 1853: 1849: 1845: 1841: 1837: 1829: 1823: 1819: 1815: 1811: 1801: 1787: 1778: 1769: 1767: 1751: 1748: 1723: 1716: 1692: 1681: 1674: 1670: 1667: 1664: 1658: 1643: 1639: 1633: 1621: 1600: 1593:if the first 1577: 1573: 1564: 1562: 1543: 1539: 1530: 1513: 1509: 1500: 1485: 1480: 1476: 1467: 1465: 1460: 1458: 1454: 1438: 1432: 1412: 1405: 1401: 1397: 1391: 1388: 1385: 1379: 1375: 1371: 1365: 1362: 1359: 1356: 1353: 1347: 1340: 1337: 1328: 1313: 1310: 1307: 1304: 1284: 1281: 1277: 1272: 1268: 1265: 1259: 1255: 1251: 1245: 1242: 1237: 1233: 1226: 1220: 1214: 1206: 1200: 1193: 1190: 1162: 1159: 1156: 1146: 1139: 1136: 1133: 1120: 1116: 1112: 1106: 1103: 1098: 1094: 1087: 1081: 1074: 1068: 1060: 1056: 1037: 1025: 1010: 996: 986: 966: 963: 957: 951: 931: 928: 925: 904: 898: 895: 889: 885: 882: 877: 873: 869: 863: 857: 824: 821: 814:The function 812: 804: 795: 793: 788: 784: 783:Stefan Banach 780: 775: 773: 769: 765: 757: 752: 749:must also be 747: 738: 732: 723: 718: 710: 704: 700:at the point 699: 695: 690: 685: 675: 673: 669: 665: 661: 656: 643: 614: 605: 599: 578: 571: 565: 562: 556: 553: 550: 544: 536: 530: 522: 516: 509: 506: 498: 497: 496: 482: 479: 476: 468: 447: 444: 416: 413: 410: 396: 394: 389: 375: 352: 341: 334: 330: 327: 324: 318: 303: 299: 293: 281: 260: 253:if its first 237: 233: 225: 207: 199: 174: 170: 163: 136: 132: 124: 121: 108: 104: 88: 82: 80: 76: 72: 69: 65: 61: 57: 53: 49: 45: 41: 32: 19: 4044:Hugging Face 4008:David Silver 3656:Audio–visual 3510:Applications 3489:Augmentation 3334: 3326: 3279: 3276:. Cited by 3261: 3258:Studia Math. 3256: 3246: 3209: 3205: 3201: 3197: 3193: 3189: 3185: 3181: 3177: 3173: 3169: 3165: 3161: 3153: 3151: 3129: 2924: 2663: 2472: 2444: 2250: 2132: 2128: 2124: 2117: 2108: 2099: 2090: 2086:neighborhood 2083: 2074: 2070: 2061: 2052: 2039: 2036: 1851: 1847: 1843: 1836:there exists 1827: 1821: 1817: 1813: 1807: 1613:derivatives 1461: 988: 779:almost every 776: 763: 755: 745: 736: 730: 727: 708: 702: 697: 667: 657: 612: 606: 595: 466: 402: 390: 273:derivatives 197: 172: 168: 161: 106: 102: 86: 83: 71:tangent line 43: 37: 4192:Categories 4140:Autoencoder 4095:Transformer 3963:Alex Graves 3911:OpenAI Five 3815:IBM Watsonx 3437:Convolution 3415:Overfitting 3132:holomorphic 2136:defined by 2088:of a point 989:A function 403:A function 40:mathematics 4218:Categories 4181:Technology 4034:EleutherAI 3993:Fei-Fei Li 3988:Yann LeCun 3901:Q-learning 3884:Decisional 3810:IBM Watson 3718:Midjourney 3610:TensorFlow 3457:Activation 3410:Regression 3405:Clustering 3238:References 3146:See also: 2452:See also: 1855:such that 1840:linear map 985:Smoothness 787:meagre set 751:continuous 682:See also: 660:continuous 598:continuous 56:derivative 4064:MIT CSAIL 4029:Anthropic 3998:Andrew Ng 3896:AlphaZero 3740:VideoPoet 3703:AlphaFold 3640:MindSpore 3594:SpiNNaker 3589:Memristor 3496:Diffusion 3472:Rectifier 3452:Batchnorm 3432:Attention 3427:Adversary 3101:¯ 3078:→ 2998:¯ 2944:→ 2861:− 2846:− 2808:∈ 2797:→ 2752:→ 2683:→ 2628:− 2595:∈ 2584:→ 2500:→ 2361:≠ 2189:≠ 2050:exist at 1998:‖ 1989:‖ 1969:‖ 1949:− 1923:− 1889:‖ 1876:→ 1783:∞ 1668:… 1651:′ 1648:′ 1626:′ 1436:→ 1392:⁡ 1386:− 1366:⁡ 1308:≠ 1273:ε 1266:− 1260:ε 1246:⁡ 1234:ε 1218:→ 1215:ε 1137:≠ 1107:⁡ 1030:′ 929:≠ 886:⁡ 833:→ 563:− 534:→ 480:∈ 448:⊂ 420:→ 328:… 311:′ 308:′ 286:′ 4172:Portals 3931:Auto-GPT 3763:Word2vec 3567:Hardware 3484:Datasets 3386:Concepts 3216:See also 3136:analytic 2868:′ 2558:′ 2389:if  2342:if  2212:if  2182:if  1341:′ 1194:′ 510:′ 125:′ 68:vertical 52:function 4054:Meta AI 3891:AlphaGo 3875:PanGu-Σ 3845:ChatGPT 3820:Granite 3768:Seq2seq 3747:Whisper 3668:WaveNet 3663:AlexNet 3635:Flux.jl 3615:PyTorch 3467:Sigmoid 3462:Softmax 3327:General 3188::  743:, then 97:, then 46:of one 4069:Huawei 4049:OpenAI 3951:People 3921:MuZero 3783:Gemini 3778:Claude 3713:DALL-E 3625:Theano 2447:(0, 0) 2253:(0, 0) 1770:class 1766:smooth 1565:class 1531:class 1501:class 1468:class 1329:imply 712:-axis. 698:except 60:domain 54:whose 4135:Mamba 3906:SARSA 3870:LLaMA 3865:BLOOM 3850:GPT-J 3840:GPT-4 3835:GPT-3 3830:GPT-2 3825:GPT-1 3788:LaMDA 3620:Keras 3176:. If 3156:is a 2543:when 2069:, an 850:with 770:, or 631:into 64:graph 4059:Mila 3860:PaLM 3793:Bard 3773:BERT 3756:Text 3735:Sora 3204:and 3180:and 2456:and 944:and 918:for 768:cusp 722:cusp 692:The 393:here 79:cusp 48:real 42:, a 3800:NMT 3683:OCR 3678:HWR 3630:JAX 3584:VPU 3579:TPU 3574:IPU 3398:SGD 3266:doi 3212:). 3164:on 3152:If 3071:lim 2788:lim 2575:lim 2473:In 1867:lim 1834:if 1389:cos 1363:sin 1243:sin 1211:lim 1104:sin 883:sin 753:at 728:If 674:). 615:on 600:at 527:lim 469:at 84:If 38:In 4220:: 3255:. 3138:. 2910:0. 2131:→ 2127:: 2115:. 2073:× 2022:0. 1850:→ 1846:: 1838:a 1820:→ 1816:: 1808:A 1459:. 1439:0. 794:. 720:A 604:. 388:. 192:. 180:. 178:)) 167:, 81:. 3313:e 3306:t 3299:v 3274:. 3268:: 3262:3 3210:p 3208:( 3206:f 3202:p 3198:p 3194:N 3190:M 3186:f 3182:N 3178:M 3174:p 3170:p 3166:M 3162:f 3154:M 3112:h 3109:2 3098:h 3092:+ 3089:h 3081:0 3075:h 3050:x 3047:= 3044:) 3041:y 3038:, 3035:x 3032:( 3029:f 3004:2 2995:z 2990:+ 2987:z 2981:= 2978:) 2975:z 2972:( 2969:f 2948:C 2940:C 2936:: 2933:f 2907:= 2900:| 2896:h 2892:| 2885:| 2881:h 2878:) 2875:a 2872:( 2865:f 2858:) 2855:a 2852:( 2849:f 2843:) 2840:h 2837:+ 2834:a 2831:( 2828:f 2824:| 2812:C 2805:h 2800:0 2794:h 2762:2 2757:R 2747:2 2742:R 2737:: 2734:f 2714:a 2711:= 2708:x 2687:C 2679:C 2675:: 2672:f 2649:. 2644:h 2640:) 2637:a 2634:( 2631:f 2625:) 2622:h 2619:+ 2616:a 2613:( 2610:f 2599:C 2592:h 2587:0 2581:h 2571:= 2568:) 2565:a 2562:( 2555:f 2531:a 2528:= 2525:x 2504:C 2496:C 2492:: 2489:f 2423:) 2420:0 2417:, 2414:0 2411:( 2408:= 2405:) 2402:y 2399:, 2396:x 2393:( 2383:0 2376:) 2373:0 2370:, 2367:0 2364:( 2358:) 2355:y 2352:, 2349:x 2346:( 2336:) 2331:2 2327:y 2323:+ 2318:2 2314:x 2310:( 2306:/ 2300:3 2296:y 2289:{ 2284:= 2281:) 2278:y 2275:, 2272:x 2269:( 2266:f 2227:2 2223:x 2219:= 2216:y 2206:0 2197:2 2193:x 2186:y 2176:x 2170:{ 2165:= 2162:) 2159:y 2156:, 2153:x 2150:( 2147:f 2133:R 2129:R 2125:f 2112:0 2109:x 2103:0 2100:x 2094:0 2091:x 2075:m 2071:n 2062:J 2056:0 2053:x 2043:0 2040:x 2019:= 2009:m 2004:R 1993:h 1980:n 1975:R 1964:) 1961:h 1958:( 1953:J 1946:) 1940:0 1936:x 1931:( 1927:f 1920:) 1916:h 1912:+ 1906:0 1902:x 1897:( 1893:f 1880:0 1872:h 1852:R 1848:R 1844:J 1831:0 1828:x 1822:R 1818:R 1814:f 1788:. 1779:C 1752:, 1749:n 1727:) 1724:n 1721:( 1717:f 1696:) 1693:x 1690:( 1685:) 1682:k 1679:( 1675:f 1671:, 1665:, 1662:) 1659:x 1656:( 1644:f 1640:, 1637:) 1634:x 1631:( 1622:f 1601:k 1578:k 1574:C 1544:2 1540:C 1514:1 1510:C 1486:, 1481:0 1477:C 1433:x 1413:, 1409:) 1406:x 1402:/ 1398:1 1395:( 1383:) 1380:x 1376:/ 1372:1 1369:( 1360:x 1357:2 1354:= 1351:) 1348:x 1345:( 1338:f 1314:, 1311:0 1305:x 1285:0 1282:= 1278:) 1269:0 1263:) 1256:/ 1252:1 1249:( 1238:2 1227:( 1221:0 1207:= 1204:) 1201:0 1198:( 1191:f 1163:0 1160:= 1157:x 1147:0 1140:0 1134:x 1124:) 1121:x 1117:/ 1113:1 1110:( 1099:2 1095:x 1088:{ 1082:= 1078:) 1075:x 1072:( 1069:f 1041:) 1038:x 1035:( 1026:f 997:f 967:0 964:= 961:) 958:0 955:( 952:f 932:0 926:x 905:) 899:x 896:1 890:( 878:2 874:x 870:= 867:) 864:x 861:( 858:f 837:R 829:R 825:: 822:f 759:0 756:x 746:f 740:0 737:x 731:f 709:y 703:x 644:. 640:R 629:U 625:f 621:U 617:U 609:f 602:a 579:h 575:) 572:a 569:( 566:f 560:) 557:h 554:+ 551:a 548:( 545:f 537:0 531:h 523:= 520:) 517:a 514:( 507:f 483:U 477:a 452:R 445:U 424:R 417:U 414:: 411:f 376:f 356:) 353:x 350:( 345:) 342:k 339:( 335:f 331:, 325:, 322:) 319:x 316:( 304:f 300:, 297:) 294:x 291:( 282:f 261:k 238:k 234:C 222:f 208:f 194:f 190:U 186:U 182:f 176:0 173:x 171:( 169:f 165:0 162:x 160:( 156:f 142:) 137:0 133:x 129:( 122:f 110:0 107:x 99:f 95:f 90:0 87:x 20:)

Index

Differentiability

mathematics
real
function
derivative
domain
graph
vertical
tangent line
linear function
cusp
here
continuous
continuous
Differentiability and continuity
Differentiability classes
Continuous function

absolute value

cusp
continuous
cusp
vertical tangent
almost every
Stefan Banach
meagre set
Weierstrass function

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