seed

I want to populate a new feature with dummy data, but don't want to use the db/seeds.rb file as it already has seeds other data irrelevant for this feature. To run the default seeds.rb file, you run the command rake db:seed . If I create a file in the db directory called seeds_feature_x.rb , what would the rake command look like to run (only) that file? zeantsoi Start by creating a separate directory to hold your custom seeds – this example uses db/seeds . Then, create a custom task by adding a rakefile to your lib/tasks directory: # lib/tasks/custom_seed.rake namespace :db do namespace :seed

最初最原始数据为训练集文件夹50组图片和mask，测试集数据为30组图片和mask。如图总共22M 经过keras数据增强后，被扩展到惊人的32.8g ， 最后报错是：MemoryError，如下图 简单贴一下相关代码， data_gen_args = dict( featurewise_center=False, featurewise_std_normalization=False, rotation_range=10., width_shift_range=0.1, height_shift_range=0.1, horizontal_flip=True, vertical_flip=True, zoom_range=[1, 1.2], fill_mode='constant', preprocessing_function=elastic) image_datagen = ImageDataGenerator(**data_gen_args) mask_datagen = ImageDataGenerator(**data_gen_args) seed = 2 #报错在这个位置 image_datagen.fit(X_train, seed=seed) mask_datagen.fit(y_train, seed=seed) image_generator = image

I am building a demo, and I want to make it very easy for a non-technical person to set up and run the demo. I have built a seeds.rb file with lots of demo data in it. I want to be able to reset the rails app to a known state by providing an administrator-level action via a page link. I don't want to provide these non-tech demonstrators with a command line and rake, because they might shoot themselves in the foot. I have looked into using load 'db/seeds.rb' within a method, but that doesn't quite do what I want. I know I am missing something, but what? You can call Rails.application.load_seed

a)In this case does the random number generator uses the system's clock (making the seed change) on each run? b)Is the seed used to generate the pseudo-random values of expovariate(lambda)? Alex Martelli "Use the Source, Luke!"...;-). Studying https://svn.python.org/projects/python/trunk/Lib/random.py will rapidly reassure you;-). What happens when seed isn't set (that's the "i is None" case): if a is None: try: a = long(_hexlify(_urandom(16)), 16) except NotImplementedError: import time a = long(time.time() * 256) # use fractional seconds and the expovariate: random = self.random u = random()

I'm looking for a function that I can pass an array and a seed to in PHP and get back a "randomized" array. If I passed the same array and same seed again, I would get the same output. I've tried this code //sample array $test = array(1,2,3,4,5,6); //show the array print_r($test); //seed the random number generator mt_srand('123'); //generate a random number based on that echo mt_rand(); echo "\n"; //shuffle the array shuffle($test); //show the results print_r($test); But it does not seem to work. Any thoughts on the best way to do this? This question dances around the issue but it's old and

Is there any way to find out what seed Python used to seed its random number generator? I know I can specify my own seed, but I'm quite happy with Python managing it. But, I do want to know what seed it used, so that if I like the results I'm getting in a particular run, I could reproduce that run later. If I had the seed that was used then I could. If the answer is I can't, then what's the best way to generate a seed myself? I want them to always be different from run to run---I just want to know what was used. UPDATE: yes, I mean random.random()! mistake... [title updated] It is not possible

题目 不是很明白为什么要叫做模板 考虑到 \(a_i\) 能对 \(b_j\) 产生贡献，当且仅当 \(a_i=\prod p_k^{a_k},b_j=\prod p_k^{b_k},\forall k \ a_k\leq b_k\) ，于是我们把每一个质数次幂看成一维，相当于对 \(a\) 数组求一个高维前缀和 于是我们枚举每一个质数次幂，利用高维前缀和的方式来做就行了，复杂度同埃筛 \(\operatorname{O(n\ log\ log\ n)}\) #include<bits/stdc++.h> #define re register #define uint unsigned int const int maxn=2e7+5; uint seed,a[maxn],ans; int n,f[maxn],p[maxn>>2]; inline uint getnxt(){ seed^=seed<<13;seed^=seed>>17; seed^=seed<<5;return seed; } int main() { scanf("%d%u",&n,&seed); for(re int i=2;i<=n;i++) { if(!f[i]) p[++p[0]]=i; for(re int j=1;j<=p[0]&&p[j]*i<=n;j++) { f[p[j]*i]=1; if(i