Seep.jl: A Tensor Flow Like Library for Julia

Seep.jl

Because not everybody's data is big.

Basics: ANodes, Arrays, and Instances

Seep builds and evaluates computational flow graphs in julia. A computational flow graph (CFG) is a directed acyclic graph where nodes represent values and edges represent data dependencies. It is similar to the Single Static Assignment form of a program used by compilers, but there is no control flow. All nodes are evaluated each time the graph is executed.

The CFG is first defined as an abstract graph using ANodes. The abstract graph specifies the size and shape of each variable, how they are connected, and how each value will be computed. It does not allocate storage or define the order of operations.

One or more instances of may be constructed from the abstract graph. Each instance is a julia function that evaluates the CFG described by the abstract graph. Storage for the values of each ANode is allocated statically when the instance is constructed. In addition to being callable as a function, the instance provides access to the Arrays on which it operates.

Creating The Abstract Graph

Abstract graphs are built from ANodes. The first ANode defined is always an input ANode (the constructors of all of the other types require ANodes as arguments). Input ANodes are build by calling the ANode(name::String, dims::Int...) constructor. The name is optional, but it helps to make any code you will write using the instance a bit cleaner and sometimes also faster.

To get started, let's create an ANode to hold a single element, and call it x.

julia> x = ANode("x", 1)

Since it's often useful to create a ANode and assign it to a variable of the same name, there is a macro called @named to do exactly that. Let's create another ANode named y using the @named macro.

julia> @named y = ANode(1)

ANodes can be treated as if they were arrays in many cases. You can't index them (i.e. x[1] won't work) since they're abstract, but you can perform arithmetic on them. The result of operating on ANodes is always a new ANode that represents the computed value.

Let's create a couple more ANodes with compute simple functions of x and y.

julia> @named begin
  a = x + y
  b = 2a - log(y)
end

This creates 4 new ANodes: a, 2a, log(y), and b. Only a and b are named and assigned to variables in the workspace. 2a and log(y) are referenced by b, but not otherwise visible.

Instantiating the Graph

So far, we've created six ANodes. Let's instantiate the graph so we can use them.

julia> graph = instance(a, b)

Each ANode passed to the instance constructor will be evaluated exactly once when the instance is evaluated. All of the nodes they reference (e.g. 2a and log(y)) will also be evaluated as necessary.

Evaluating the Graph

To use the graph, we first have to provide values for the input nodes. The arrays that were allocated when the instance was created are available as fields of the instance. Let's populate the input ANodes' backing arrays with some data.

julia> graph.x[1] = 1
julia> graph.y[1] = 2

Now that the inputs are populated, we can evaluate the instance by calling it as a function.

julia> graph()

Finally, we can use the results by inspecting the arrays where the results are stored.

julia> println(graph.a)
julia> println(graph.b)

More Information

This has been a short introduction that shows only the most basic features of Seep. For mor information, see the doc/ directory in the root of the source tree.

Disclaimer.

DISTRIBUTION STATEMENT A. Approved for public release: distribution unlimited.

© 2017 MASSACHUSETTS INSTITUTE OF TECHNOLOGY.

  • Subject to FAR 52.227-11 – Patent Rights – Ownership by the Contractor (May 2014).
  • SPDX-License-Identifier: MIT.

This material is based upon work supported by the Undersecretary of Defense for Research and Engineering under Air Force Contract No. FA8721-05-C-0002. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of USD(R&E).

The software/firmware is provided to you on an As-Is basis.

Download Details:

Author: mit-ll
Source Code: https://github.com/mit-ll/Seep.jl 
License: MIT license

#julia #flow #arrays 

What is GEEK

Buddha Community

Seep.jl: A Tensor Flow Like Library for Julia

Seep.jl: A Tensor Flow Like Library for Julia

Seep.jl

Because not everybody's data is big.

Basics: ANodes, Arrays, and Instances

Seep builds and evaluates computational flow graphs in julia. A computational flow graph (CFG) is a directed acyclic graph where nodes represent values and edges represent data dependencies. It is similar to the Single Static Assignment form of a program used by compilers, but there is no control flow. All nodes are evaluated each time the graph is executed.

The CFG is first defined as an abstract graph using ANodes. The abstract graph specifies the size and shape of each variable, how they are connected, and how each value will be computed. It does not allocate storage or define the order of operations.

One or more instances of may be constructed from the abstract graph. Each instance is a julia function that evaluates the CFG described by the abstract graph. Storage for the values of each ANode is allocated statically when the instance is constructed. In addition to being callable as a function, the instance provides access to the Arrays on which it operates.

Creating The Abstract Graph

Abstract graphs are built from ANodes. The first ANode defined is always an input ANode (the constructors of all of the other types require ANodes as arguments). Input ANodes are build by calling the ANode(name::String, dims::Int...) constructor. The name is optional, but it helps to make any code you will write using the instance a bit cleaner and sometimes also faster.

To get started, let's create an ANode to hold a single element, and call it x.

julia> x = ANode("x", 1)

Since it's often useful to create a ANode and assign it to a variable of the same name, there is a macro called @named to do exactly that. Let's create another ANode named y using the @named macro.

julia> @named y = ANode(1)

ANodes can be treated as if they were arrays in many cases. You can't index them (i.e. x[1] won't work) since they're abstract, but you can perform arithmetic on them. The result of operating on ANodes is always a new ANode that represents the computed value.

Let's create a couple more ANodes with compute simple functions of x and y.

julia> @named begin
  a = x + y
  b = 2a - log(y)
end

This creates 4 new ANodes: a, 2a, log(y), and b. Only a and b are named and assigned to variables in the workspace. 2a and log(y) are referenced by b, but not otherwise visible.

Instantiating the Graph

So far, we've created six ANodes. Let's instantiate the graph so we can use them.

julia> graph = instance(a, b)

Each ANode passed to the instance constructor will be evaluated exactly once when the instance is evaluated. All of the nodes they reference (e.g. 2a and log(y)) will also be evaluated as necessary.

Evaluating the Graph

To use the graph, we first have to provide values for the input nodes. The arrays that were allocated when the instance was created are available as fields of the instance. Let's populate the input ANodes' backing arrays with some data.

julia> graph.x[1] = 1
julia> graph.y[1] = 2

Now that the inputs are populated, we can evaluate the instance by calling it as a function.

julia> graph()

Finally, we can use the results by inspecting the arrays where the results are stored.

julia> println(graph.a)
julia> println(graph.b)

More Information

This has been a short introduction that shows only the most basic features of Seep. For mor information, see the doc/ directory in the root of the source tree.

Disclaimer.

DISTRIBUTION STATEMENT A. Approved for public release: distribution unlimited.

© 2017 MASSACHUSETTS INSTITUTE OF TECHNOLOGY.

  • Subject to FAR 52.227-11 – Patent Rights – Ownership by the Contractor (May 2014).
  • SPDX-License-Identifier: MIT.

This material is based upon work supported by the Undersecretary of Defense for Research and Engineering under Air Force Contract No. FA8721-05-C-0002. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of USD(R&E).

The software/firmware is provided to you on an As-Is basis.

Download Details:

Author: mit-ll
Source Code: https://github.com/mit-ll/Seep.jl 
License: MIT license

#julia #flow #arrays 

Carmen  Grimes

Carmen Grimes

1595491178

Best Electric Bikes and Scooters for Rental Business or Campus Facility

The electric scooter revolution has caught on super-fast taking many cities across the globe by storm. eScooters, a renovated version of old-school scooters now turned into electric vehicles are an environmentally friendly solution to current on-demand commute problems. They work on engines, like cars, enabling short traveling distances without hassle. The result is that these groundbreaking electric machines can now provide faster transport for less — cheaper than Uber and faster than Metro.

Since they are durable, fast, easy to operate and maintain, and are more convenient to park compared to four-wheelers, the eScooters trend has and continues to spike interest as a promising growth area. Several companies and universities are increasingly setting up shop to provide eScooter services realizing a would-be profitable business model and a ready customer base that is university students or residents in need of faster and cheap travel going about their business in school, town, and other surrounding areas.

Electric Scooters Trends and Statistics

In many countries including the U.S., Canada, Mexico, U.K., Germany, France, China, Japan, India, Brazil and Mexico and more, a growing number of eScooter users both locals and tourists can now be seen effortlessly passing lines of drivers stuck in the endless and unmoving traffic.

A recent report by McKinsey revealed that the E-Scooter industry will be worth― $200 billion to $300 billion in the United States, $100 billion to $150 billion in Europe, and $30 billion to $50 billion in China in 2030. The e-Scooter revenue model will also spike and is projected to rise by more than 20% amounting to approximately $5 billion.

And, with a necessity to move people away from high carbon prints, traffic and congestion issues brought about by car-centric transport systems in cities, more and more city planners are developing more bike/scooter lanes and adopting zero-emission plans. This is the force behind the booming electric scooter market and the numbers will only go higher and higher.

Companies that have taken advantage of the growing eScooter trend develop an appthat allows them to provide efficient eScooter services. Such an app enables them to be able to locate bike pick-up and drop points through fully integrated google maps.

List of Best Electric Bikes for Rental Business or Campus Facility 2020:

It’s clear that e scooters will increasingly become more common and the e-scooter business model will continue to grab the attention of manufacturers, investors, entrepreneurs. All this should go ahead with a quest to know what are some of the best electric bikes in the market especially for anyone who would want to get started in the electric bikes/scooters rental business.

We have done a comprehensive list of the best electric bikes! Each bike has been reviewed in depth and includes a full list of specs and a photo.

Billy eBike

mobile-best-electric-bikes-scooters https://www.kickstarter.com/projects/enkicycles/billy-were-redefining-joyrides

To start us off is the Billy eBike, a powerful go-anywhere urban electric bike that’s specially designed to offer an exciting ride like no other whether you want to ride to the grocery store, cafe, work or school. The Billy eBike comes in 4 color options – Billy Blue, Polished aluminium, Artic white, and Stealth black.

Price: $2490

Available countries

Available in the USA, Europe, Asia, South Africa and Australia.This item ships from the USA. Buyers are therefore responsible for any taxes and/or customs duties incurred once it arrives in your country.

Features

  • Control – Ride with confidence with our ultra-wide BMX bars and a hyper-responsive twist throttle.
  • Stealth- Ride like a ninja with our Gates carbon drive that’s as smooth as butter and maintenance-free.
  • Drive – Ride further with our high torque fat bike motor, giving a better climbing performance.
  • Accelerate – Ride quicker with our 20-inch lightweight cutout rims for improved acceleration.
  • Customize – Ride your own way with 5 levels of power control. Each level determines power and speed.
  • Flickable – Ride harder with our BMX /MotoX inspired geometry and lightweight aluminum package

Specifications

  • Maximum speed: 20 mph (32 km/h)
  • Range per charge: 41 miles (66 km)
  • Maximum Power: 500W
  • Motor type: Fat Bike Motor: Bafang RM G060.500.DC
  • Load capacity: 300lbs (136kg)
  • Battery type: 13.6Ah Samsung lithium-ion,
  • Battery capacity: On/off-bike charging available
  • Weight: w/o batt. 48.5lbs (22kg), w/ batt. 54lbs (24.5kg)
  • Front Suspension: Fully adjustable air shock, preload/compression damping /lockout
  • Rear Suspension: spring, preload adjustment
  • Built-in GPS

Why Should You Buy This?

  • Riding fun and excitement
  • Better climbing ability and faster acceleration.
  • Ride with confidence
  • Billy folds for convenient storage and transportation.
  • Shorty levers connect to disc brakes ensuring you stop on a dime
  • belt drives are maintenance-free and clean (no oil or lubrication needed)

**Who Should Ride Billy? **

Both new and experienced riders

**Where to Buy? **Local distributors or ships from the USA.

Genze 200 series e-Bike

genze-best-electric-bikes-scooters https://www.genze.com/fleet/

Featuring a sleek and lightweight aluminum frame design, the 200-Series ebike takes your riding experience to greater heights. Available in both black and white this ebike comes with a connected app, which allows you to plan activities, map distances and routes while also allowing connections with fellow riders.

Price: $2099.00

Available countries

The Genze 200 series e-Bike is available at GenZe retail locations across the U.S or online via GenZe.com website. Customers from outside the US can ship the product while incurring the relevant charges.

Features

  • 2 Frame Options
  • 2 Sizes
  • Integrated/Removable Battery
  • Throttle and Pedal Assist Ride Modes
  • Integrated LCD Display
  • Connected App
  • 24 month warranty
  • GPS navigation
  • Bluetooth connectivity

Specifications

  • Maximum speed: 20 mph with throttle
  • Range per charge: 15-18 miles w/ throttle and 30-50 miles w/ pedal assist
  • Charging time: 3.5 hours
  • Motor type: Brushless Rear Hub Motor
  • Gears: Microshift Thumb Shifter
  • Battery type: Removable Samsung 36V, 9.6AH Li-Ion battery pack
  • Battery capacity: 36V and 350 Wh
  • Weight: 46 pounds
  • Derailleur: 8-speed Shimano
  • Brakes: Dual classic
  • Wheels: 26 x 20 inches
  • Frame: 16, and 18 inches
  • Operating Mode: Analog mode 5 levels of Pedal Assist Thrott­le Mode

Norco from eBikestore

norco-best-electric-bikes-scooters https://ebikestore.com/shop/norco-vlt-s2/

The Norco VLT S2 is a front suspension e-Bike with solid components alongside the reliable Bosch Performance Line Power systems that offer precise pedal assistance during any riding situation.

Price: $2,699.00

Available countries

This item is available via the various Norco bikes international distributors.

Features

  • VLT aluminum frame- for stiffness and wheel security.
  • Bosch e-bike system – for their reliability and performance.
  • E-bike components – for added durability.
  • Hydraulic disc brakes – offer riders more stopping power for safety and control at higher speeds.
  • Practical design features – to add convenience and versatility.

Specifications

  • Maximum speed: KMC X9 9spd
  • Motor type: Bosch Active Line
  • Gears: Shimano Altus RD-M2000, SGS, 9 Speed
  • Battery type: Power Pack 400
  • Battery capacity: 396Wh
  • Suspension: SR Suntour suspension fork
  • Frame: Norco VLT, Aluminum, 12x142mm TA Dropouts

Bodo EV

bodo-best-electric-bikes-scootershttp://www.bodoevs.com/bodoev/products_show.asp?product_id=13

Manufactured by Bodo Vehicle Group Limited, the Bodo EV is specially designed for strong power and extraordinary long service to facilitate super amazing rides. The Bodo Vehicle Company is a striking top in electric vehicles brand field in China and across the globe. Their Bodo EV will no doubt provide your riders with high-level riding satisfaction owing to its high-quality design, strength, breaking stability and speed.

Price: $799

Available countries

This item ships from China with buyers bearing the shipping costs and other variables prior to delivery.

Features

  • Reliable
  • Environment friendly
  • Comfortable riding
  • Fashionable
  • Economical
  • Durable – long service life
  • Braking stability
  • LED lighting technology

Specifications

  • Maximum speed: 45km/h
  • Range per charge: 50km per person
  • Charging time: 8 hours
  • Maximum Power: 3000W
  • Motor type: Brushless DC Motor
  • Load capacity: 100kg
  • Battery type: Lead-acid battery
  • Battery capacity: 60V 20AH
  • Weight: w/o battery 47kg

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Carmen  Grimes

Carmen Grimes

1595494844

How to start an electric scooter facility/fleet in a university campus/IT park

Are you leading an organization that has a large campus, e.g., a large university? You are probably thinking of introducing an electric scooter/bicycle fleet on the campus, and why wouldn’t you?

Introducing micro-mobility in your campus with the help of such a fleet would help the people on the campus significantly. People would save money since they don’t need to use a car for a short distance. Your campus will see a drastic reduction in congestion, moreover, its carbon footprint will reduce.

Micro-mobility is relatively new though and you would need help. You would need to select an appropriate fleet of vehicles. The people on your campus would need to find electric scooters or electric bikes for commuting, and you need to provide a solution for this.

To be more specific, you need a short-term electric bike rental app. With such an app, you will be able to easily offer micro-mobility to the people on the campus. We at Devathon have built Autorent exactly for this.

What does Autorent do and how can it help you? How does it enable you to introduce micro-mobility on your campus? We explain these in this article, however, we will touch upon a few basics first.

Micro-mobility: What it is

micro-mobility

You are probably thinking about micro-mobility relatively recently, aren’t you? A few relevant insights about it could help you to better appreciate its importance.

Micro-mobility is a new trend in transportation, and it uses vehicles that are considerably smaller than cars. Electric scooters (e-scooters) and electric bikes (e-bikes) are the most popular forms of micro-mobility, however, there are also e-unicycles and e-skateboards.

You might have already seen e-scooters, which are kick scooters that come with a motor. Thanks to its motor, an e-scooter can achieve a speed of up to 20 km/h. On the other hand, e-bikes are popular in China and Japan, and they come with a motor, and you can reach a speed of 40 km/h.

You obviously can’t use these vehicles for very long commutes, however, what if you need to travel a short distance? Even if you have a reasonable public transport facility in the city, it might not cover the route you need to take. Take the example of a large university campus. Such a campus is often at a considerable distance from the central business district of the city where it’s located. While public transport facilities may serve the central business district, they wouldn’t serve this large campus. Currently, many people drive their cars even for short distances.

As you know, that brings its own set of challenges. Vehicular traffic adds significantly to pollution, moreover, finding a parking spot can be hard in crowded urban districts.

Well, you can reduce your carbon footprint if you use an electric car. However, electric cars are still new, and many countries are still building the necessary infrastructure for them. Your large campus might not have the necessary infrastructure for them either. Presently, electric cars don’t represent a viable option in most geographies.

As a result, you need to buy and maintain a car even if your commute is short. In addition to dealing with parking problems, you need to spend significantly on your car.

All of these factors have combined to make people sit up and think seriously about cars. Many people are now seriously considering whether a car is really the best option even if they have to commute only a short distance.

This is where micro-mobility enters the picture. When you commute a short distance regularly, e-scooters or e-bikes are viable options. You limit your carbon footprints and you cut costs!

Businesses have seen this shift in thinking, and e-scooter companies like Lime and Bird have entered this field in a big way. They let you rent e-scooters by the minute. On the other hand, start-ups like Jump and Lyft have entered the e-bike market.

Think of your campus now! The people there might need to travel short distances within the campus, and e-scooters can really help them.

How micro-mobility can benefit you

benefits-micromobility

What advantages can you get from micro-mobility? Let’s take a deeper look into this question.

Micro-mobility can offer several advantages to the people on your campus, e.g.:

  • Affordability: Shared e-scooters are cheaper than other mass transportation options. Remember that the people on your campus will use them on a shared basis, and they will pay for their short commutes only. Well, depending on your operating model, you might even let them use shared e-scooters or e-bikes for free!
  • Convenience: Users don’t need to worry about finding parking spots for shared e-scooters since these are small. They can easily travel from point A to point B on your campus with the help of these e-scooters.
  • Environmentally sustainable: Shared e-scooters reduce the carbon footprint, moreover, they decongest the roads. Statistics from the pilot programs in cities like Portland and Denver showimpressive gains around this key aspect.
  • Safety: This one’s obvious, isn’t it? When people on your campus use small e-scooters or e-bikes instead of cars, the problem of overspeeding will disappear. you will see fewer accidents.

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Jenny Jabde

1621251999

Quick Flow Male Enhancement Reviews, Benefits Price & Buy Quick Flow?

364bb242-ab45-4601-b9cc-e444f2270076

On the off chance that you fall in the subsequent class, Quick Flow Male Enhancement is the thing that your body is needing right now. The recently discovered male arrangement is the difficult solver for numerous types and types of erectile pressure causing brokenness and causes those issues to be rectified and henceforth blessings you with the more youthful sexual variant.

What is Quick Flow Male Enhancement?
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**How can it really function? **

Different results of this class have numerous regular Ingredients in them, yet the ones here in Quick Flow Male Enhancement are truly uncommon and furthermore natural in their reap and produce. This allows you to get the experience of the truth of more profound sex intercourse which you generally thought was a fantasy for you. Positively, this is a demonstrated natural thing, and relying upon it is no place off-base according to specialists. It is time that your body is given valuable minerals as requested by age.

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It is fundamental that you visit the site and see by your own eyes you willing we are to help you in each progression. Start from the terms and furthermore know inconspicuously the states of procurement. Any question must be addressed as of now or, more than likely later things probably won’t go as you might suspect. Purchase Quick Flow Male Enhancement utilizing any method of online installment and you may likewise go for the simple EMI choice out there.

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How much does it cost to develop an app like Skype?

Skype is a telecommunications mobile app that specializes in providing video chat and voice calls between computers, tablets, mobile devices, and smartwatches over the Internet. Skype allows the users to chat, make video calls, send instant messages, exchange files and images, send video messages & create conference calls.

Benefits of making a mobile app like Skype:

  • Audio and HD video calling
  • Smart messaging
  • Screen sharing
  • Call recording and Live subtitles
  • Call phones
  • Private conversations

Cost to Make an App like Skype

The cost of developing an app like Skype will depend on the different features of Skype that you can find and use. For instance, if you have already set the features, functionality and the different ways of communication using Skype, the cost you’ll pay in getting a Skype phone number is low.

Skype is indeed a very famous App and to develop an App like Skype is surely a wise move for your App business. The Cost of an App like Skype lies between $7,000 to $25,000 depending upon the features and functionality of your App.

Basic Features of App like Skype:

Admin Panel

  • Dashboard
  • Push Notifications
  • Ads and Promotions
  • Feature Management
  • User Queries

User Panel

  • Skype Profile
  • Audio and Video Calls
  • Send Messages
  • Fun Emojis
  • Private Conversations

Best Company to make an app like Skype:

AppClues Infotech is the best mobile app development company in the USA that builds high quality, secure and excellent performance mobile app at an affordable cost. We have the best mobile technology knowledge on multiple platforms like Android, iOS, Cross-Platform, M-Commerce, Etc.

We have a highly skilled and well experienced mobile app designer and developers team that have a deep knowledge of programming languages which help to make an exceptional mobile app. We take pride in having delivered more than 450+ successful mobile app development projects worldwide while assisting clients through the journey of ideation to deployment.

If you have planning to make a custom mobile app for your business or personal requirement then contact AppClues Infotech to get the right solutions. Get in touch with us to get a free consultation & quote for your project.

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