Placeholders allow you to feed values into a tensorflow graph. Aditionally They allow you to specify constraints regarding the dimensions and data type of the values being fed in. As such they are useful when creating a neural network to feed new training examples.
The following example declares a ...
Suppose we want to count how many counties are there in Texas:
var counties = dbContext.States.Single(s => s.Code == "tx").Counties.Count();
The query is correct, but inefficient. States.Single(…) loads a state from the database. Next, Counties loads all 254 counties with all of the...
select_dtypes method can be used to select columns based on dtype.
In [1]: df = pd.DataFrame({'A': [1, 2, 3], 'B': [1.0, 2.0, 3.0], 'C': ['a', 'b', 'c'],
'D': [True, False, True]})
In [2]: df
Out[2]:
A B C D
0 1 1.0 a True
1 2 2.0 b False
2...
This example shows how to create a prepared statement with an insert statement with parameters, set values to those parameters and then executing the statement.
Connection connection = ... // connection created earlier
try (PreparedStatement insert = connection.prepareStatement(
"i...
In PaaS sites such as Heroku, it is usual to receive the database information as a single URL environment variable, instead of several parameters (host, port, user, password...).
There is a module, dj_database_url which automatically extracts the DATABASE_URL environment variable to a Python dictio...
When the GADTs extension is enabled, besides regular data declarations, you can also declare generalized algebraic datatypes as follows:
data DataType a where
Constr1 :: Int -> a -> Foo a -> DataType a
Constr2 :: Show a => a -> DataType a
Constr3 :: DataType Int
A G...
HTTP requests are made through the WSClient class, which you can use as an injected parameter into your own classes.
import javax.inject.Inject
import play.api.libs.ws.WSClient
import scala.concurrent.{ExecutionContext, Future}
class MyClass @Inject() (
wsClient: WSClient
)(implicit ...
Useful for scripting to drop all tables and deletes the database:
mysqladmin -u[username] -p[password] drop [database]
Use with extreme caution.
To DROP database as a SQL Script (you will need DROP privilege on that database):
DROP DATABASE database_name
or
DROP SCHEMA database_name
A typical singleton class :
import javax.inject._
@Singleton
class BurgersRepository {
// implementation goes here
}
Another class, requiring access to the first one.
import javax.inject._
class FastFoodService @Inject() (burgersRepository: BurgersRepository){
// implementation ...
The Storage facade may be used to interact with any of your configured disks. Alternatively, you may type-hint the Illuminate\Contracts\Filesystem\Factory contract on any class that is resolved via the Laravel service container.
Retrieving A Particular Disk
$disk = Storage::disk('s3');
$disk = ...
Meteor.call(name, [arg1, arg2...], [asyncCallback])
(1) name String
(2) Name of method to invoke
(3) arg1, arg2... EJSON-able Object [Optional]
(4) asyncCallback Function [Optional]
On one hand, you can do : (via Session variable, or via ReactiveVar)
var syncCall = Meteor.call("my...
Mongoid tries to have similar syntax to ActiveRecord when it can. It supports these calls (and many more)
User.first #Gets first user from the database
User.count #Gets the count of all users from the database
User.find(params[:id]) #Returns the user with the id found in params[:id]
User.w...
1) Create a Contract Class
A contract class defines constants that help applications work with the content URIs, column names, intent actions, and other features of a content provider. Contract classes are not included automatically with a provider; the provider's developer has to define them and t...
When an HTTP server receives a well-formed HTTP request, it must process the information that request contains and return a response to the client. A simple HTTP 1.1 response, may look like any of the following, usually followed by a number of header fields, and possibly a response body:
HTTP/1.1 2...
pacman is a simple package manager for R.
pacman allows a user to compactly load all desired packages, installing any which are missing (and their dependencies), with a single command, p_load. pacman does not require the user to type quotation marks around a package name. Basic usage is as follows:...
A pointer to base class can be converted to a pointer to derived class using static_cast. static_cast does not do any run-time checking and can lead to undefined behaviour when the pointer does not actually point to the desired type.
struct Base {};
struct Derived : Base {};
Derived d;
Base* p1 ...
What is a Set?
A set is a data structure which contains a set of elements with an important property that no two elements in the set are equal.
Types of Set:
HashSet: A set backed by a hash table (actually a HashMap instance)
Linked HashSet: A Set backed by Hash table and linked list, with pre...
