deterministic

问题 I have a very large simulation in python with lots of modules. I call a lot of random functions. To keep the same random results I have a variable keep_seed_random. As so: import random keep_seed_random = True if keep_seed_random is False: fixed_seed = random.Random(0) else: fixed_seed = random Then I use fixed_seed all over the program, such as fixed_seed.choice(['male', 'female']) fixed_seed.randint() fixed_seed.gammavariate(3, 3) fixed_seed.random() fixed_seed.randrange(20, 40) and so on..

问题 I assume this is not deterministic simply because DB_NAME() is not deterministic? If DB_NAME() is not deterministic, why is it not deterministic? ALTER FUNCTION [TheSchema].[udf_IS_PRODUCTION] () RETURNS bit WITH SCHEMABINDING AS BEGIN RETURN CASE WHEN DB_NAME() = 'PRODUCTION' THEN CONVERT(bit, 1) ELSE CONVERT(bit, 0) END END Update: This version works, is deterministic, allows the same code to be used in any database and removes the hardcoding of the database name (which also allows me to

问题 I have been reading about Quicksort and found that sometimes it' s referred to as "Deterministic Quicksort". Is this an alternate version of the normal Quicksort ? What is the difference between a normal Quicksort and a Deterministic Quicksort ? 回答1: The ordinary ("deterministic") Quicksort can have very poor behaviour on particular datasets (as an example, an implementation that picks the first unsorted element has O(n^2) time complexity on already-sorted data). Randomized Quicksort (which

问题 Now I have a really tricky thing with Oracle execution plans running havoc, when I use a DETERMINISTIC function on the right hand side of the LIKE operator. This is my situation: The Situation I thought it to be wise to execute a query like this (simplified): SELECT [...] FROM customers cust JOIN addresses addr ON addr.cust_id = cust.id WHERE special_char_filter(cust.surname) like special_char_filter(?) And I would bind ? to something like 'Eder%' . Now customers and addresses are very large

问题 Having already read this question I'm reasonably certain that a given process using floating point arithmatic with the same input (on the same hardware, compiled with the same compiler) should be deterministic. I'm looking at a case where this isn't true and trying to determine what could have caused this. I've compiled an executable and I'm feeding it the exact same data, running on a single machine (non-multithreaded) but I'm getting errors of about 3.814697265625e-06 which after careful

问题 So after I realize there are operations in TensorFlow which are non-deterministic, see this Question: How to get the same loss value, every time training a CNN (MNIST data set), with TensorFlow?, I want to know: How can I build a convolutional neural net with: TensorFlow Version 1.1.0 CUDA release 8.0, V8.0.61 cuDNN 5.1.10 run on GPU which use only deterministic operations? 回答1: You can't until every operation on cuDNN is not completely deterministic. Moreover, even moving every operation on

问题 Are floating point operations in Delphi deterministic? I.E. will I get the same result from an identical floating point mathematical operation on the same executable compiled with Delphi Win32 compiler as I would with the Win64 compiler, or the OS X compiler, or the iOS compiler, or the Android compiler? This is a crucial question as I'm implementing multiplayer support in my game engine, and I'm concerned that the predictive results on the client side could very often differ from the

问题 I'd like to make some shuffles of sets which will be the same every time my program is run: This is one way to do it: (def colours ["red" "blue" "green" "yellow" "cyan" "magenta" "black" "white"]) (defn colour-shuffle [n] (let [cs (nth (clojure.math.combinatorics/permutations colours) n)] [(first cs) (drop 1 cs)])) ; use (rand-int 40320) to make up numbers, then hard code: (def colour-shuffle-39038 (colour-shuffle 39038)) (def colour-shuffle-28193 (colour-shuffle 28193)) (def colour-shuffle

问题 I have a problem which has an solution that can be solved by iteration, but I'm wondering if there's a more elegant solution using regular expressions and split() I have a string (which excel is putting on the clipboard), which is, in essence, comma delimited. The caveat is that when the cell values contain a comma, the whole cell is surrounded with quotation marks (presumably to escape the commas within that string). An example string is as follows: 123,12,"12,345",834,54,"1,111","98,273","1

问题 I'm writing an Android game using LibGDX and Box2D. I'm planning on adding a turn-based multiplayer feature to it. Now, if on both clients I step the Box2D world at the same rate with the same time steps and I start a simulation on both clients with the exact same initial parameters, when the simulations are over, will the final state of both simulations be exactly the same? In other words, is a Box2D simulation perfectly deterministic? If it's not, then that means every time a simulation is