Author: admin
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SQLite History
SQLite was designed originally on August 2000. It is named SQLite because it is very light weight (less than 500Kb size) unlike other database management systems like SQL Server or Oracle. Year Happenings 2000 SQLite was designed by D. Richard Hipp for the purpose of no administration required for operating a program. 2000 In August…
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SQL vs SQLite
Differences between SQL and SQLite SQL SQLite SQL is a Structured Query Language used to query a Relational Database System. It is written in C language. SQLite is an Embeddable Relational Database Management System which is written in ANSI-C. SQL is a standard which specifies how a relational schema is created, data is inserted or…
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SQLite Tutorial
SQLite Tutorial provides basic and advanced concepts of SQLite. Our SQLite Tutorial is designed for beginners and professionals both. SQLite is embedded relational database management system. It is self-contained, serverless, zero configuration and transactional SQL database engine. Our SQLite Tutorial includes all topics of SQLite such as SQLite with history, features, advantages, installation, commands, syntax,…
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Conclusion
The Machine Learning model building involves intensive and repetitive computations involving tensors. These require intensive computing resources. As a regular compiler would provide the optimizations at the local level, it does not generally produce a fast execution code. Theano first builds a computational graph for the entire computation. As the whole picture of computation is…
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Trivial Training Example
Theano is quite useful in training neural networks where we have to repeatedly calculate cost, and gradients to achieve an optimum. On large datasets, this becomes computationally intensive. Theano does this efficiently due to its internal optimizations of the computational graph that we have seen earlier. Problem Statement We shall now learn how to use…
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Functions
Theano function acts like a hook for interacting with the symbolic graph. A symbolic graph is compiled into a highly efficient execution code. It achieves this by restructuring mathematical equations to make them faster. It compiles some parts of the expression into C language code. It moves some tensors to the GPU, and so on. The efficient…
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Shared Variables
Many a times, you would need to create variables which are shared between different functions and also between multiple calls to the same function. To cite an example, while training a neural network you create weights vector for assigning a weight to each feature under consideration. This vector is modified on every iteration during the…
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Data Types
Now, that you have understood the basics of Theano, let us begin with the different data types available to you for creating your expressions. The following table gives you a partial list of data types defined in Theano. Data type Theano type Byte bscalar, bvector, bmatrix, brow, bcol, btensor3, btensor4, btensor5, btensor6, btensor7 16-bit integers…
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Computational Graph
From the above two examples, you may have noticed that in Theano we create an expression which is eventually evaluated using the Theano function. Theano uses advanced optimization techniques to optimize the execution of an expression. To visualize the computation graph, Theano provides a printing package in its library. Symbolic Graph for Scalar Addition To see the computation…
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Expression for Matrix Multiplication
We will compute a dot product of two matrices. The first matrix is of dimension 2 x 3 and the second one is of dimension 3 x 2. The matrices that we used as input and their product are expressed here − [04−11122]⎡⎣⎢3135−1220⎤⎦⎥=[1135020][0−124112][3−1123520]=[1103520] Declaring Variables To write a Theano expression for the above, we first…