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"Big data" is a data set with a particularly large volume and data categories, and such data sets cannot be captured, managed and processed by traditional database tools. "Big data" first refers to data volumes? Large refers to a large data set, usually in 10TB? However, in practical application, many enterprise users put multiple data sets together, which has formed PB-level data volume; Secondly, it refers to the large variety of data, which comes from a variety of data sources, and the types and formats of data are increasingly rich. It has broken through the previously defined structured data category, including semi-structured and unstructured data. Secondly, the speed of data processing is fast, and the real-time processing of data can be achieved even when the amount of data is huge. The last feature is the high authenticity of data. With the interest of new data sources such as social data, enterprise content, transaction and application data, the limitations of traditional data sources have been broken, and enterprises increasingly need effective information power to ensure their authenticity and security.

Data collection: ETL tools are responsible for extracting data from distributed and heterogeneous data sources, such as relational data and flat data files, into the temporary middle layer, cleaning, converting and integrating them, and finally loading them into data warehouses or data marts, which become the basis of online analysis and data mining.

Access to data: relational database, NOSQL, SQL, etc.

Infrastructure: Cloud storage, distributed file storage, etc.

Data processing: NLP (NaturalLanguageProcessing) is a subject that studies the language problems of human-computer interaction. The key to natural language processing is to make computers "understand" natural language, so natural language processing is also called NLU (NaturalLanguage Understanding), also known as Computational Linguistics. On the one hand, it is a branch of language information processing; on the other hand, it is one of the core topics of artificial intelligence.

Statistics: hypothesis test, significance test, variance analysis, correlation analysis, t-test, variance analysis, chi-square analysis, partial correlation analysis, distance analysis, regression analysis, simple regression analysis, multiple regression analysis, stepwise regression, regression prediction and residual analysis, ridge regression, logistic regression analysis, curve estimation, factor analysis, cluster analysis, principal component analysis, factor analysis, fast clustering method and clustering method

Data mining: Classification, Estimation, Prediction, affinity grouping or association rules, Clustering, Description and Visualization, complex data type mining (Text, Web, graphics, video, audio, etc.)

Prediction: prediction model, machine learning, modeling and simulation.

Results: Cloud computing, tag cloud, diagram, etc.

To understand the concept of big data, we should first start with "big", which refers to the data scale. Big data generally refers to the amount of data above 10TB(1TB=1024GB). Big data is different from massive data in the past, and its basic characteristics can be summarized by four V’s (Vol-ume, Variety, Value and Veloc-ity), namely, large volume, diversity, low value density and high speed.

First, the data volume is huge. From TB level to PB level.

Secondly, there are many types of data, such as weblogs, videos, pictures, geographical location information, and so on.

Third, the value density is low. Take video as an example. During continuous monitoring, the data that may be useful is only one or two seconds.

Fourthly, the processing speed is fast. 1 second law. This last point is also fundamentally different from the traditional data mining technology. Internet of Things, cloud computing, mobile Internet, Internet of Vehicles, mobile phones, tablets, PCs, and various sensors all over the globe are all data sources or ways of carrying them.

Author: Science and Technology BB

Recently, my mood is really bad, and I don’t say a pile of things. I recently girlfriend, I can’t move it, I will have a flame mountain every time I go home.

Know the mountain, I have a tiger, I am biased towards the mountain! (Don’t go back, how can I come, I haven’t understood it, I maybe it is possible.

The fire is really big, how is the Sichuan hot pot? It is not a level, this is spell damage, which is far better than physical damage.

Cause: She is estimated by the fire because the weather is dry, blowing air conditioners at night, causing the body’s moisture loss, thus causing anger. In order to give the ancestors to reduce the fire, I also had a pain, and I bought a big humidifier. Using a humidifier, the dry environment in the home is really a lot, and the girlfriend is significantly smaller. Since there is an effect, it is ready to arrange to the ancestors. In order to let her in the dry weather, they are not lacking in the loss of moisture, drinking water must be necessary (buy a cup), can be in the humidifier in the humidifier, A card frozen mini humidifier (from the product test).

Demand: Humidifier, small, and portable in the office. Second, the value is not bad, otherwise not only can’t destroy the fire, it is easy to enter the oil. Humidifier is used, and cost-effective. (Satisfied, there is basically nothing)

The humidifier is mainly divided into two types of household humidifiers and industrial humidifiers.

One is an ultrasonic humidifier, one is a pure humidifier.

The chevan frog humidifier belongs to the ultrasonic humidifier category, which can disperse 5 microns water molecules, so that the skin enjoys the benefits of the benefits, one gesture to meet daily humidity demand, two rain forests are booming moisture summer air-conditioned room, winter heating dry, accompanied 365 days a year.

This humidifier has a leather handle, which is convenient to carry two spray ports. Two add water methods, which can directly open the top cover for humidifier, plus water, of course, you can also add water from the top. Add water, you can do not open the water, the open water is a little suitable for the bottle to slowly pour it, prevent water flow splash.

The package accessory manual, the data cable, and the water-absorbent (itself can be used for a long time can be replaced) is still very thoughtful, it does not need to be purchased again at least in a short time.

The chevy humidifier built into a 2000mAh built-in battery, and it can be done for 7 hours or so, and it can be inserted, and the charging hole is Micro-USB design, the back of the humidifier. If it is a Type-C port applicability will be higher.

The humidifier is turned on, click Open a single hole spray mode.

The humidifier is turned on, and the double hole spray mode can be opened if you double-click.

The humidifier top cover can be separated, convenient to water storage, the upper cover is the main functional area, and the water tank can be appropriately added according to the scale.

The water absorbers on the humidifier can be swapped, and the inside is a filter element, dirty can be replaced, always maintains hygienic, effectively inhibits the hyperplasia of bacterial viruses.

The water tank also comes with rice wheat stone, which can be fixed at the bottom of the humidifier, and countless fine small holes on the rice stone can also filter the impurities in natural water. The humidifier uses water dispenser filtration, and there is bacteriostatic silver ion and The water absorbing filter has a good antibacterial effect under the action of double protection.

This product is suitable for tap water, do not use pure water, distilled water, if the water soluble essential oil can be placed, because his fog is KHz microporous atomization piece. Atomized water without white powder, its atomization piece is also specially treated, and the anti-corrosion is done.

There is a non-slip mat design at the bottom, which can make the humidifier to be more secure and will not slip freely.

The key next to the key is a timed switch, and the length of the humidification can be set with you, and you can set 1H / 2H / 4H, no operation, after 12h, the machine will shut down by default. Meet your different needs.

【Summarize】

This humidifier positioning is portable, easy to take place, suitable for office, small square room. Simple design style, whether as humidified tools, or as a room for the room, is a good choice.

My girlfriend has had a small humidifier in the house with a small humidifier, and the skin is moist. Of course, my happiest is that my girlfriend is a lot, no longer with sleep. NS.

This small humidifier, color value and function are very good, I have a deep heart.

This is still very nice if you have a demand.

Recommended index: five stars

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