Thanks to Brendan O’Connor, this cheatsheet aims to be a quick reference of Scala syntactic constructions. Licensed by Brendan O’Connor under a CC-BY-SA 3.0 license.
I hope this huge list will be helpful to you. If you like any of the cheatsheet whether it will be machine learning algorithms cheat sheet or scikit-learn cheat sheet or data visualization cheat sheet or keras cheat sheet or tensorflow cheat sheet or any other cheatsheets, then please share this list with others, so they can also use this in machine learning or data science task. Apache Spark Streaming the most popular open-source framework for micro-batch processing. Vertica offers support for microbatches. Additional resources and further reading. The above are general guidelines for determining when to use batch vs stream processing. However, each of these topics warrants much further research in its own right. Scala on Spark Cheatsheet; SQL to Hive Cheat Sheet; Hive Functions Cheat-sheet; Conclusion. So these are 70 Data Science Cheat Sheets. I will keep adding more data science cheat sheets to this list. But I hope you will find these data science cheat sheets helpful for your data science journey. If you have any doubt or questions, feel free to. Having a good cheatsheet at hand can significantly speed up the development process. One of the best cheatsheet I have came across is sparklyr’s cheatsheet. For my work, I’m using Spark’s DataFrame API in Scala to create data transformation pipelines. These are some functions and design patterns that I’ve found to be extremely useful. We will see how to install and run Apache Spark in the standalone Lightning speed of computation because data are loaded in distributed memory (RAM) over a cluster of machines.
| variables | |
Good | Variable. |
Bad | Constant. |
| Explicit type. | |
| functions | |
| Good Bad | Define function. Hidden error: without = it’s a procedure returning Unit; causes havoc. Deprecated in Scala 2.13. |
| Good Bad | Define function. Syntax error: need types for every arg. |
| Type alias. | |
| vs. | Call-by-value. Call-by-name (lazy parameters). |
| Anonymous function. | |
| vs. | Anonymous function: underscore is positionally matched arg. |
| Anonymous function: to use an arg twice, have to name it. | |
| Anonymous function: block style returns last expression. | |
| Anonymous functions: pipeline style (or parens too). | |
| Anonymous functions: to pass in multiple blocks, need outer parens. | |
| Currying, obvious syntax. | |
| Currying, obvious syntax. | |
| Currying, sugar syntax. But then: | |
| Need trailing underscore to get the partial, only for the sugar version. | |
| Generic type. | |
| Infix sugar. | |
| Varargs. | |
| packages | |
| Wildcard import. | |
| Selective import. | |
| Renaming import. | |
Import all from java.util except Date. | |
| At start of file: Packaging by scope: Package singleton: | Declare a package. |
| data structures | |
Tuple literal (Tuple3). | |
| Destructuring bind: tuple unpacking via pattern matching. | |
| Bad | Hidden error: each assigned to the entire tuple. |
| List (immutable). | |
| Paren indexing (slides). | |
| Cons. | |
| same as | Range sugar. |
| Empty parens is singleton value of the Unit type. Equivalent to void in C and Java. | |
| control constructs | |
| Conditional. | |
same as | Conditional sugar. |
| While loop. | |
| Do-while loop. | |
| Break (slides). | |
same as | For-comprehension: filter/map. |
same as | For-comprehension: destructuring bind. |
same as | For-comprehension: cross product. |
For-comprehension: imperative-ish.sprintf style. | |
| For-comprehension: iterate including the upper bound. | |
| For-comprehension: iterate omitting the upper bound. | |
| pattern matching | |
| Good Bad | Use case in function args for pattern matching. |
| Bad | v42 is interpreted as a name matching any Int value, and “42” is printed. |
| Good | `v42` with backticks is interpreted as the existing val v42, and “Not 42” is printed. |
| Good | UppercaseVal is treated as an existing val, rather than a new pattern variable, because it starts with an uppercase letter. Thus, the value contained within UppercaseVal is checked against 3, and “Not 42” is printed. |
| object orientation | |
Constructor params - x is only available in class body. | |
| Constructor params - automatic public member defined. | |
| Constructor is class body. Declare a public member. Declare a gettable but not settable member. Declare a private member. Alternative constructor. | |
| Anonymous class. | |
| Define an abstract class (non-createable). | |
| Define an inherited class. | |
| Inheritance and constructor params (wishlist: automatically pass-up params by default). | |
| Define a singleton (module-like). | |
| Traits. Interfaces-with-implementation. No constructor params. mixin-able. | |
| Multiple traits. | |
| Must declare method overrides. | |
| Create object. | |
| Bad Good | Type error: abstract type. Instead, convention: callable factory shadowing the type. |
| Class literal. | |
| Type check (runtime). | |
| Type cast (runtime). | |
| Ascription (compile time). | |
| options | |
| Construct a non empty optional value. | |
| The singleton empty optional value. | |
| but | Null-safe optional value factory. |
| same as | Explicit type for empty optional value. Factory for empty optional value. |
| Pipeline style. | |
| For-comprehension syntax. | |
| same as | Apply a function on the optional value. |
| same as | Same as map but function must return an optional value. |
| same as | Extract nested option. |
| same as | Apply a procedure on optional value. |
| same as | Apply function on optional value, return default if empty. |
| same as | Apply partial pattern match on optional value. |
| same as | true if not empty. |
| same as | true if empty. |
| same as | true if not empty. |
| same as | 0 if empty, otherwise 1. |
| same as | Evaluate and return alternate optional value if empty. |
| same as | Evaluate and return default value if empty. |
| same as | Return value, throw exception if empty. |
| same as | Return value, null if empty. |
| same as | Optional value satisfies predicate. |
| same as | Optional value doesn't satisfy predicate. |
| same as | Apply predicate on optional value or false if empty. |
| same as | Apply predicate on optional value or true if empty. |
| same as | Checks if value equals optional value or false if empty. |
RuPaul’s Drag Race is no stranger to romances behind the scenes — and sometimes, on camera. Touch drivers for mac. On the show’s thirteenth season, New York queen Tina Burner spoke about her relationship with another Drag Racefixture: Drag Race UK judge and longtime TV host Graham Norton.
Graham Norton and Tina Burner had a ‘whirlwind’ romance
In his 2014 memoir The Life and Loves of a He Devil, Norton called their relationship a “whirlwind romance” and described Tina Burner (whose name out of drag is Kristian Seeber) as “tall and broad-shouldered with an easy smile that took up half his face.”
Norton’s friends didn’t necessarily approve of Tina or their relationship, but “what they couldn’t see was the special spark that fires within him,” the Irish TV host said. He went on to say that if the Season 13 queen “were to be judged solely on his behavior, then I concede he was not great boyfriend material.”
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Tina Burner moved in with Graham Norton
Norton and Burner dated for a few months in the early 2000s before taking a break. Soon afterward, they got back together and Burner moved in with Norton across the pond.
According to Norton, it was an “experiment” that went horribly wrong. “The experiment lasted for about six months and it was a disaster,” the TV host said. Finally, Burner was the one who called it quits, breaking up with Norton over lunch. Norton recalled walking home and “finding some comfort in the fact that a man in his mid-forties could still feel such heartache.”
RELATED: ‘RuPaul’s Drag Race’: Which Singer Has Had the Most Lip Sync Songs in the Emmy-Winning Show’s History? What is the best terminal for mac.
Tina Burner discussed her relationship with Graham Norton on ‘RuPaul’s Drag Race’
Given Norton’s connection to the RuPaul’s Drag Race world in recent years and Tina Burner’s casting on Season 13, it was only a matter of time before the New York City icon mentioned her relationship with Norton.
When Rosé references Burner’s “fling” with Norton, Burner corrects her by clarifying that it was a full-fledged relationship. She went on to discuss their time together and had nothing but great things to say about her ex.
“Graham is so famous, he’s at that level where your life is just like put on a platform. He’s such a great guy and it never ever got to him,” she remembered. “It was the most amazing thing.”
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Still, Burner’s relationship with Norton took a toll on her psyche. It was before she was a famous drag queen, and as a result, people who saw their relationship presumed that she was in it for herself. Phone cleaner for mac. “I remember people passing judgment on me right away when they don’t even know me: ‘Are you after his money? Are you this? Are you that?'” she said. “People want to draw their own opinions.”
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Ultimately, Norton was happy with Burner’s career choice of drag. “It seems like the perfect job for him,” Norton wrote. “He gets paid to show off and drink.”