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Machine Learning without Programming Weka can be used to build machine learning pipelines, train classifiers, and run evaluations without having to write a single line of code: Open a dataset First, we open the dataset that we would like to evaluate. Choose a classifier Second, we select a learning algorithm to use, e. Evaluate predictive accuracy Finally, we run a fold cross-validation evaluation and obtain an estimate of predictive performance. Deep neural networks, including convolutional networks and recurrent networks, can be trained directly from Weka's graphical user interfaces, providing state-of-the-art methods for tasks such as image and text classification.
The technique article source originally invented is still used in electron microscopywhere it is known as electron holographybut optical holography did not really advance until the development of the laser in They were not very efficient as the produced grating absorbed much of the incident Homemade Water Filter Essay. Various methods of converting the variation in transmission to a variation in refractive index known as "bleaching" were developed which enabled much more efficient holograms to be produced. Transmission holograms, such as those produced by Leith and Upatnieks, are viewed by shining laser light Watwr them and looking at the reconstructed image from the side of the hologram opposite the source.
They are also capable of multicolour-image reproduction. Most holograms produced are of static objects but systems for displaying changing scenes on a holographic volumetric display are now being developed. It was thought that it would be possible to use X-rays to make holograms of Watef small objects and view them using visible light. Due to the shorter wavelength of x-rays compared to visible light, this approach allows imaging objects with higher spatial resolution. The hologram recorded an images of a toy van and car. It is no more possible to discern the subject of the hologram from this pattern than it is to identify what music has been recorded by looking at a Homemade Water Filter Essay surface.
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The holographic information is recorded by the speckle pattern Holography is a technique that enables a light field which is generally the result of a light source scattered off objects to be recorded and later reconstructed when the original light field is no longer present, due to the absence of the original objects. Laser[ edit ] In laser holography, the hologram is recorded using a source of Homemade Water Filter Essay light, which is very pure in its color and orderly in its composition.
Various setups may be used, and several types of holograms can be made, but all involve the interaction of light coming from different directions and producing a microscopic interference pattern which a platefilm, or other medium photographically records. In one common arrangement, the laser Wafer is split into two, one known as the object beam and the other as the reference beam.
The object beam is expanded by passing it through a lens and used to illuminate the subject. The recording medium is located where this light, after being reflected or scattered by the subject, will strike it. The edges of the medium will ultimately serve as a window through which the subject is seen, so its location is chosen with that in mind.
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The reference beam is expanded and made to shine directly on the medium, where it interacts with the light coming from the subject to create the desired interference pattern. Like conventional photography, holography requires an appropriate exposure time to correctly affect the recording medium. Unlike conventional photography, during the exposure the light source, the optical elements, the recording medium, and the subject must all remain motionless relative to each other, to within about a quarter of the wavelength of the light, or the interference pattern will be blurred and the hologram spoiled.
With living subjects and some unstable materials, that is only possible if a very intense and extremely Homemadf pulse of laser light is used, a hazardous procedure which is rare and rarely done outside of scientific and industrial laboratory settings.]
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