strategy | Strategy source code for hft | Game Engine library
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Strategy source code for hft.
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QUESTION
I'm trying to make a relation between my Book entity and a list of languages that I retrieve through a service. In my database, each book has a: ID, TITLE, CATEGORY_ID (FK), LANG_ID
Book.java:
...ANSWER
Answered 2021-Jun-15 at 12:54First of all, did you consider to store language in your database? I mean language are mostly the same, doesn't change too often, you can also store in a properties file and read them at runtime to use them later.
Anyway, I think you should:
- first get from external system languages
- store in variable / in memory cache ( like a Map where you can store id and name )
- read your data from database
- for each row you do
- read book language id, read the cache, get out data you need
- for each row you do
If you can't change model, just use a dto with your entity and the language and you're fine
QUESTION
I would like to know whether there is a recommended way of measuring execution time in Tensorflow Federated. To be more specific, if one would like to extract the execution time for each client in a certain round, e.g., for each client involved in a FedAvg round, saving the time stamp before the local training starts and the time stamp just before sending back the updates, what is the best (or just correct) strategy to do this? Furthermore, since the clients' code run in parallel, are such a time stamps untruthful (especially considering the hypothesis that different clients may be using differently sized models for local training)?
To be very practical, using tf.timestamp()
at the beginning and at the end of @tf.function
client_update(model, dataset, server_message, client_optimizer)
-- this is probably a simplified signature -- and then subtracting such time stamps is appropriate?
I have the feeling that this is not the right way to do this given that clients run in parallel on the same machine.
Thanks to anyone can help me on that.
...ANSWER
Answered 2021-Jun-15 at 12:01There are multiple potential places to measure execution time, first might be defining very specifically what is the intended measurement.
Measuring the training time of each client as proposed is a great way to get a sense of the variability among clients. This could help identify whether rounds frequently have stragglers. Using
tf.timestamp()
at the beginning and end of theclient_update
function seems reasonable. The question correctly notes that this happens in parallel, summing all of these times would be akin to CPU time.Measuring the time it takes to complete all client training in a round would generally be the maximum of the values above. This might not be true when simulating FL in TFF, as TFF maybe decided to run some number of clients sequentially due to system resources constraints. In practice all of these clients would run in parallel.
Measuring the time it takes to complete a full round (the maximum time it takes to run a client, plus the time it takes for the server to update) could be done by moving the
tf.timestamp
calls to the outer training loop. This would be wrapping the call totrainer.next()
in the snippet on https://www.tensorflow.org/federated. This would be most similar to elapsed real time (wall clock time).
QUESTION
This probably ins't typical setup, but due to higher decisions we endup having multiple kafka clusters within one app, multiple topics per each, and each might have different serializing strategy. Json/avro. And avro might be with confluent schema registry or using single object encoding.
Well I got it working somehow, by building my own abstractions and registry which analyzes the configuration and creates most of stuff manually, but I feel I needed to repeat stuff like topic names, schema registry url on several places multiple times just to create all needed beans. Ugly as hell.
I'd like to ask, if there is some better way and support for this I just might have overlooked.
I need to create N representations of kafka clusters, configuring it once. Configure topics respective to given kafka cluster, configure confluent schema registry for topics where applicable etc, so that I can create instance of Avro schema file, send it to KafkaTemplate and it will work.
...ANSWER
Answered 2021-Jun-15 at 13:28It depends on the complexity and how much different the configurations are, as to whether this will help, but you can override individual Kafka properties (such as bootstrap servers, deserializers, etc on the @KafkaListener
and in each KafkaTemplate
.
e.g.
QUESTION
I have two entity classes as follows. The Parachute
is the parent object and it has multiple Component
objects. I need to have bidirectional @OneToMany implemented here.
Parent Parachute.java
class.
ANSWER
Answered 2021-Jun-15 at 06:17You are violating the JPA spec by accessing the persistence context in a lifecycle listener.
See the JPA Specification 4.2 Section 3.5.2
In general, the lifecycle method of a portable application should not invoke EntityManager or query operations, access other entity instances, or modify relationships within the same persistence context. A lifecycle callback method may modify the non-relationship state of the entity on which it is invoked.
"a portable application should not" is the specification way of saying: Don't do that, anything might happen. Maybe the world ends.
The fix is not to do that. Maybe be preloading the currently logged in user and reference it so you may access it in your entity listener and do not set a reference to the user, but simple store its id or similar.
QUESTION
I'm building app to learn Hibernate on PostgreSQL. And I'm currently trying to add variable to database that has OneToOne relationship.
First, I create two tables in my database with schema below. On person_detail
table it has primary key that's also foreign key to person
table.
Then I created two classes, Person
and PersonDetail
. PersonDetail
is child of Person
that has OneToOne relationship. And I use code below to add person
with personDetail
as attribute.
ANSWER
Answered 2021-Jun-14 at 14:17I see that you have primary key in table person_details
as foreign key to person
table, you can use @PrimaryKeyJoinColumn
like this:
QUESTION
in my example here i want to display a list of appointments of a specific patient in a one to many relationships .. the process is going well but the problem is how to display this list which is in patient as an attribute.
Appointment Entity
...ANSWER
Answered 2021-Jun-14 at 21:02As you have many to one mapping in Appointment entity. you could write the below query in AppointmentRep
List findAllByPatientId(int id);
QUESTION
I am fetching data from table named Cars(fetching models of particular brand and one brand can have multiple models). After selecting brand, I want to display all models and its details inside a form on JSP page. The data is an ArrayList of objects of ArrayList of object and I want to iterate it and display each field on my JSP Page.
Repository :
...ANSWER
Answered 2021-Jun-14 at 11:50Why do you not use foreach loop?
QUESTION
Why lombok doesnt not crate constructor with args
...ANSWER
Answered 2021-Jun-14 at 08:44As per Lombok documentation (https://projectlombok.org/api/lombok/AllArgsConstructor.html):
An all-args constructor requires one argument for every field in the class.
Obviously you haven't provided id as a constructor argument.
QUESTION
I have a problem when I want save repository by foreach loop . By Foreach loop user come and save it to another entity
User.class
public class Attendance {
...ANSWER
Answered 2021-Jun-14 at 08:28Mixing what I saw in your code and what you said in comments I found the guilty.
- the trigger line :
System.out.println("Attendance List "+attendanceList+"\n");
- the cause :
@Data
This annotation will add a toString implementation on your objects and by default it prints all the non static fields... causing infinite cyclic calls because attendance tries to print user then user tries to print attendance and again attendance tries to print user... you're looping forever.
Either add the annotation @ToString.Exclude
on one of the 2 relationships or re-write toString implementation by yourself.
Always take care on code generation frameworks like Lombok. It could give you some nasty surprises ;-)
QUESTION
dispatcher-servlet.xml
...ANSWER
Answered 2021-Jun-14 at 02:53This issue is solved after correcting up my code
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