normalization

问题 I want to know how BatchNormalization works in keras, so I write the code: X_input = keras.Input((2,)) X = keras.layers.BatchNormalization(axis=1)(X_input) model1 = keras.Model(inputs=X_input, outputs=X) the input is a batch of two dimenstions vector, and normalizing it along axis=1, then print the output: a = np.arange(4).reshape((2,2)) print('a=') print(a) print('output=') print(model1.predict(a,batch_size=2)) and the output is: a= array([[0, 1], [2, 3]]) output= array([[ 0. , 0.99950039],

问题 I have a multi-band (20 layers) raster loaded into R as a RasterBrick using brick() . My plan is to normalize each band from 0 to 1 using the approach that was proposed in this thread: https://stats.stackexchange.com/questions/70801/how-to-normalize-data-to-0-1-range Here some sample code to visualize my problem: for(j in 1:nlayers(tif)){ min <- cellStats(tif[[j]],'min') max <- cellStats(tif[[j]],'max') for(i in 1:ncell(tif)){ tif[i][j] <- (tif[i][j]-min)/(max-min) } } "tif" contains the

问题 This question already has answers here : Normalization: What does “repeating groups” mean? (2 answers) Closed 5 years ago . There seems to be a misconception on what is a 'repeating group', in terms of its removal in 1st Normal Form (1NF), could any one clearly clarify what it actually is and how to identify one? The misconception, I found, is discussed further here: https://stackoverflow.com/a/23202535/4011506. However, that has further confused me. In regards to the following video (4:30

问题 s2 is a normalized s1 as string s1 and s2 appear the same s1 and s2 have a different GetHashCode String.Compare shows s1 and s2 as equivalent s2 as a string has the accent s2.ToCharArray removes the accent Why is s2.ToCharArray different from s2 as a string? I figured it out. The length of s2 is 4. The accent is just stripped out as a separate char (Int16 = 769). String.Compare is smart enough figure it out. What is interesting is that String.Compare figures it out but String.Contains does

问题 I was thinking about some stuff lately and I was wondering what would be the RIGHT way to do something like the following scenario (I'm sure it is a quite common thing for DB guys to do something like it). Let's say you have a products table, something like this (MySQL): CREATE TABLE `products` ( `id` int(11) NOT NULL auto_increment, `product_name` varchar(255) default NULL, `product_description` text, KEY `id` (`id`), KEY `product_name` (`product_name`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

问题 I have two tables: customer ( client_id(PK), lastname, firstname, flightID (Fk) ) flight ( flight_id(PK), flightarrival, flightdepart ) My questions are: Are there any problems with the schema? How can I add data to the flight table? I really want to separate the two because bulk tables are confusing. Here is an example of a "bulk table": customer( client_id(PK), lastname, firstname, flightarrival, flightdepart ) but I want to normalize it and separate it from the customer table and just link

问题 Following on from this question last_question with this table `id`, `bbs_id`, `user_id`, `like_dislike` (15, 4, 2, 0), (14, 4, 1, 0), (13, 3, 1, 0), (12, 2, 1, 1), (11, 1, 2, 0), (10, 1, 1, 1); How can I see what an individual users like or dislike was? Lets say I wanted to have an aggregate table of all the likes and dislikes with another column for whether user x liked it. This is the query that I have tried $user_id = 1; SELECT bbs_id, (SELECT like_dislike FROM bb_ratings WHERE user_id={

问题 A SQL VIEW is a global, logical table that may or may not be persisted. But it's still a table. Therefore, should a VIEW always adhere to first normal form (1NF)? i.e. no duplicate rows, scalar types only, no top-to-bottom or left-to-right ordering, etc. What about the higher normal forms? For me, my applications 'consume' the results of stored procs, my VIEWs are 'consumed' by SQL queries, and these two usages are mutually exclusive (i.e. I don’t query the resultsets of stored procs using

问题 I'm trying to convert all Latin unicode Character into their [a-z] representations ó --> o í --> i I can easily do one by one for example: myString = myString.replaceAll("ó","o"); but since there are tons of variations, this approach is just impractical Is there another way of doing it in Java? for example a regular Expression , or a utility library USE CASE: 1- city names from another languages into english e.g. Espírito Santo --> Espirito Santo, 回答1: This answer requires Java 1.6 or above,

问题 I'm trying to convert all Latin unicode Character into their [a-z] representations ó --> o í --> i I can easily do one by one for example: myString = myString.replaceAll("ó","o"); but since there are tons of variations, this approach is just impractical Is there another way of doing it in Java? for example a regular Expression , or a utility library USE CASE: 1- city names from another languages into english e.g. Espírito Santo --> Espirito Santo, 回答1: This answer requires Java 1.6 or above,