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[introduction] I wrote a blog before< [Spring Boot] Mybatis Plus 2.X condition query >, we know that the query methods of Mybatis Plus 2.X and 3.X are not the same. This blog will summarize the application of various query methods of 3.X. [example] Take the query of article table as an example to ...

Article directory Grouping and aggregation 1. GroupBy object ·Parameters in the groupedby function: GroupBy object group iteration = = = "traversal" Other grouping methods polymerization Grouping operation Group and align Statistical calculation yao differential aggregation aggreg ...

New features of Java 8 -- Lambda expression Before Java 8, we wanted a method to interact with the user, such as using local variables within the method. At this time, we can only use the interface as a parameter, so that the user can implement the interface or use the form of anonymous inner class t ...

In versions of C before 2.0, the only way to declare a delegate was to use a named method. C ා 2.0 introduces anonymous methods, while in C ා 3.0 and later, Lambda expressions replace anonymous methods as the preferred way to write inline code. In one case, anonymous methods provide functionality tha ...

1. Tools for functools to manage functions The functools module provides tools to adjust or extend functions and other callable objects without requiring a complete override. 1.1 Modifier The main tool provided by the functools module is the partial class, which can be used to "wrap" a callable object with default parameters.The resul ...

Task07: advanced optimization algorithm; word2vec; advanced word embedding 1. Advanced optimization algorithm Momentum In Section 11.4, we mentioned that the gradient of the objective function with respect to the independent variable represents the direction in which the objective function declines ...

Attention mechanism In section Encoder-Decoder (seq2seq), the decoder relies on the same context vector to obtain input sequence information at each time step.When the encoder is a circular nerve network, the background variable comes to the hidden state of its final time step.The source sequence inpu ...

Before that, we talked about the stream operation in java8, which is divided into intermediate operation and terminal operation. In terminal operation, we also saw the reduction mode. This article mainly refers to the reduction operation mode collection, collector operation and collector operation, which can be regarded as a mo ...

Reference article: datasets: quick learn Datasets: quick learn tf.data Read memory data from the numpy array. Read the csv file line by line. Basic input Learning how to get array fragments is the easiest way to start learning tf.data. Premade Estimators def train_input_fn(features, labels, batch_ ...

pyspark learning -- 2. pyspark's running method attempt and various sample code attempts Operation method Pycharmrun spark operation in the system: spark submit Start spark task run Sample code Streaming text processing streaming context Stream text word count Error reporting summary Operati ...