- Pharo-users - lists.pharo.org

Re: [Pharo-users] MOOC offline download

by Peter Uhnak

Everything is also on github so you can clone it locally https://github.com/SquareBracketAssociates/PharoMooc On Thu, Apr 27, 2017 at 11:50:22PM +0800, Ben Coman wrote: > I was just chatting with someone with limited Internet who was looking to > odownload the mooc files [1] for use offline. Does such exist? > > [1] http://files.pharo.org/mooc > > cheers -ben

April 27, 2017

IMPORTANT: iceberg home changed

by Esteban Lorenzano

As part of our work for release, I changed the home of Iceberg into his own place: https://github.com/pharo-vcs/iceberg So, now to install you will need: Metacello new baseline: 'Iceberg'; repository: 'github://pharo-vcs/iceberg:dev-0.4'; load. I also uploaded a Configuration to the *catalog>http://catalog.pharo.org*, so you can load while doing the transition.

April 27, 2017

MOOC offline download

by Ben Coman

I was just chatting with someone with limited Internet who was looking to odownload the mooc files [1] for use offline. Does such exist? [1] http://files.pharo.org/mooc cheers -ben

April 27, 2017

Re: [Pharo-users] Neural Networks in Pharo

by Oleks

Hello, I have finally added a configuration to the NeuralNetwork project. Now you can use this Metacello script to load it into your Pharo image: Metacello new repository: 'http://smalltalkhub.com/mc/Oleks/NeuralNetwork/main'; configuration: 'MLNeuralNetwork'; version: #development; load. Sorry for the delay Oleks On Tue, Apr 25, 2017 at 4:13 PM, francescoagati [via Smalltalk] < ml+s1294792n4944028h93(a)n4.nabble.com> wrote: > thanks ;-) > > 2017-04-25 15:09 GMT+02:00 Oleks <[hidden email] > <http:///user/SendEmail.jtp?type=node&node=4944028&i=0>>: > >> Hello, >> >> There isn't one yet. But I will try to create it today. I will let you >> know >> >> Cheers, >> Oleks >> >> On Apr 25, 2017 16:10, "francescoagati [via Smalltalk]" <[hidden email] >> <http:///user/SendEmail.jtp?type=node&node=4944027&i=0>> wrote: >> >>> Hi Oleks, >>> there is a mode for install neural network from metacello? >>> >>> 2017-04-25 13:00 GMT+02:00 Alexandre Bergel <[hidden email] >>> <http:///user/SendEmail.jtp?type=node&node=4944025&i=0>>: >>> >>>> Continue to push that topic Oleks. You are on the right track! >>>> >>>> Alexandre >>>> >>>> > On Apr 24, 2017, at 1:43 AM, Oleks <[hidden email] >>>> <http:///user/SendEmail.jtp?type=node&node=4944025&i=1>> wrote: >>>> > >>>> > Hello, >>>> > >>>> > Thanks a lot for your advice! It was very helpful and educating (for >>>> > example, I thought that we store biases in the weight matrix and >>>> prepend 1 >>>> > to input to make it faster, but now I see why it's actually slower >>>> that >>>> > way). >>>> > >>>> > I've implemented a multi-layer neural network as a linked list of >>>> layers >>>> > that propagate the input and error from one to another, similar to >>>> the Chain >>>> > of Responsibility pattern. Also, now I represent biases as separate >>>> vectors. >>>> > The LearningAlgorithm is a separate class with Backpropagation as its >>>> > subclass (though at this point the network can only learn through >>>> > backpropagation, but I'm planning to change that). I'm trying to >>>> figure out >>>> > how the activation and cost functions should be connected. For >>>> example, >>>> > cross-entropy works best with logistic sigmoid activation etc. I >>>> would like >>>> > to give the user a freedom to use whatever he wants (plug in whatever >>>> you >>>> > like and see what happens), but it can be very inefficient (because >>>> some >>>> > time-consuming parts of activation and cost derivatives cancel out >>>> each >>>> > other). >>>> > >>>> > Also, there is an interface for setting the learning rate for the >>>> whole >>>> > network, which can be used to choose the learning rate prior to >>>> learning, as >>>> > well as to change the learning rate after each iteration. I am >>>> planning to >>>> > implement some optimization algorithms that would automize the >>>> process of >>>> > choosing a learning rate (adagrad for example), but this would >>>> require a bit >>>> > different design (maybe I will implement the Optimizer, as you >>>> suggested). >>>> > >>>> > I'm attaching two images with UML diagrams, describing my current >>>> > implementation. Could you please tell me what you think about this >>>> design? >>>> > The first image is a class diagram that shows the whole architecture, >>>> and >>>> > the second one is a sequence diagram of backpropagation. >>>> > >>>> > mlnn.png <http://forum.world.st/file/n4943698/mlnn.png> >>>> > backprop.png <http://forum.world.st/file/n4943698/backprop.png> >>>> > >>>> > Sincerely yours, >>>> > Oleksandr >>>> > >>>> > >>>> > >>>> > -- >>>> > View this message in context: http://forum.world.st/Neural-N >>>> etworks-in-Pharo-tp4941271p4943698.html >>>> > Sent from the Pharo Smalltalk Users mailing list archive at >>>> Nabble.com. >>>> > >>>> >>>> -- >>>> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >>>> Alexandre Bergel http://www.bergel.eu >>>> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >>>> >>>> >>>> >>>> >>>> >>> >>> >>> ------------------------------ >>> If you reply to this email, your message will be added to the discussion >>> below: >>> http://forum.world.st/Neural-Networks-in-Pharo-tp4941271p4944025.html >>> To unsubscribe from Neural Networks in Pharo, click here. >>> NAML >>> <http://forum.world.st/template/NamlServlet.jtp?macro=macro_viewer&id=instan…> >>> >> >> ------------------------------ >> View this message in context: Re: Neural Networks in Pharo >> <http://forum.world.st/Neural-Networks-in-Pharo-tp4941271p4944027.html> >> >> Sent from the Pharo Smalltalk Users mailing list archive >> <http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html> at >> Nabble.com. >> > > > > ------------------------------ > If you reply to this email, your message will be added to the discussion > below: > http://forum.world.st/Neural-Networks-in-Pharo-tp4941271p4944028.html > To unsubscribe from Neural Networks in Pharo, click here > <http://forum.world.st/template/NamlServlet.jtp?macro=unsubscribe_by_code&no…> > . > NAML > <http://forum.world.st/template/NamlServlet.jtp?macro=macro_viewer&id=instan…> > -- View this message in context: http://forum.world.st/Neural-Networks-in-Pharo-tp4941271p4944473.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 27, 2017

Re: [Pharo-users] [Ann] Pharo Sprint App to improve coordination during Pharo Sprints

by Luc Fabresse

Nice Juraj! ;-) #Luc 2017-04-24 20:51 GMT+02:00 K K Subbu <kksubbu.ml(a)gmail.com>: > On Monday 24 April 2017 08:00 PM, Juraj Kubelka wrote: > >> >> Please, can you send me a screenshot? Or submit the screenshot >> here https://github.com/JurajKubelka/PharoSprint/issues/new >> > > Done. I think the error appears because when a login fails, the message > causes a horiz scroll bar to be added to the panel pushing the fields > beyond the top edge. I stumbled on this error because I tried using my > fogbugz id whereas the login field needs the registered email id for login. > > Regards .. Subbu > >

April 27, 2017

Re: [Pharo-users] Sending byte array in a JSON format

by Sven Van Caekenberghe

> On 27 Apr 2017, at 14:57, Juraj Kubelka <juraj.kubelka(a)icloud.com> wrote: > > Hi, > > Thatâs great! Thank you a lot for the information :-) Well, it is Peter who came up with the alternative request. All credit to him. > Juraj > >> On Apr 27, 2017, at 09:52, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: >> >> >>> On 26 Apr 2017, at 17:21, Peter Uhnak <i.uhnak(a)gmail.com> wrote: >>> >>> Maybe the content is not properly stored in the JSON on github' side? But you can use base64 in `accept:` to make it work. >>> >>> json := STONJSON fromString: (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3.base64+json'; >>> get). >>> b64 := ((json at: 'files') at: 'thumbnail.png') at: 'content'. >>> PNGReadWriter formFromStream: (Base64MimeConverter mimeDecodeToBytes: content readStream). >> >> Ah, great that you found a way to force the server to send the data in a more sensible way ! >> >> Using the latest code from Zn & NeoJSON, combining with another recent thread (accessing nested dictionaries), this could be written as: >> >> json := NeoJSONObject fromString: (ZnClient new >> url: 'https://api.github.com/gists/5503544'; >> accept: 'application/vnd.github.v3.base64+json'; >> get). >> b64 := json atPath: #('files' 'thumbnail.png' 'content'). >> PNGReadWriter formFromStream: (ZnBase64Encoder new decode: b64) readStream. >> >> Sven >> >>> Peter >>> >>> >>> On Wed, Apr 26, 2017 at 04:50:04PM +0200, Sven Van Caekenberghe wrote: >>>> I am puzzled by how they actually encoded the PNG as a String, I tried a couple of alternatives but I could not get binary data out of it so that it parsed successfully as PNG. >>>> >>>> If I would have to encode binary data in JSON I would use Base64 encoding (but alternatives exist). >>>> >>>>> On 24 Apr 2017, at 20:36, Juraj Kubelka <juraj.kubelka(a)icloud.com> wrote: >>>>> >>>>> Hi, >>>>> >>>>> I was playing with GitHub Gist API and I have queried the following Gist: https://gist.github.com/mbostock/5503544 >>>>> I was interested how the PNG image is returned: https://gist.github.com/mbostock/5503544#file-thumbnail-png >>>>> >>>>> I can obtain the whole Gist executing: >>>>> >>>>> STONJSON fromString: >>>>> (ZnClient new >>>>> url: 'https://api.github.com/gists/5503544'; >>>>> accept: 'application/vnd.github.v3+json'; >>>>> get). >>>>> >>>>> I can get PNG contents executing: >>>>> >>>>> pngData := (ZnEasy get: >>>>> ((((STONJSON fromString: >>>>> (ZnClient new >>>>> url: 'https://api.github.com/gists/5503544'; >>>>> accept: 'application/vnd.github.v3+json'; >>>>> get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) contents. >>>>> PNGReadWriter formFromStream: rawPng readStream. >>>>> >>>>> But the PNG image is part of the Gist query and can be retrieved by: >>>>> >>>>> pngContent := ((((STONJSON fromString: >>>>> (ZnClient new >>>>> url: 'https://api.github.com/gists/5503544'; >>>>> accept: 'application/vnd.github.v3+json'; >>>>> get)) at: 'files') at: 'thumbnail.png') at: 'content'). >>>>> >>>>> "As pngContent is a WideString, I cannot use:" >>>>> PNGReadWriter formFromStream: pngContent readStream. >>>>> >>>>> How can I read the PNG image from the pngContent? Any idea? >>>>> And the reverse question: How can I send the PNG bytes using JSON format? >>>>> >>>>> Thanks! >>>>> Juraj >>>>> >>>> >>>> >>> >> >> > >

April 27, 2017

Re: [Pharo-users] Sending byte array in a JSON format

by Juraj Kubelka

Hi, Thatâs great! Thank you a lot for the information :-) Juraj > On Apr 27, 2017, at 09:52, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > >> On 26 Apr 2017, at 17:21, Peter Uhnak <i.uhnak(a)gmail.com> wrote: >> >> Maybe the content is not properly stored in the JSON on github' side? But you can use base64 in `accept:` to make it work. >> >> json := STONJSON fromString: (ZnClient new >> url: 'https://api.github.com/gists/5503544'; >> accept: 'application/vnd.github.v3.base64+json'; >> get). >> b64 := ((json at: 'files') at: 'thumbnail.png') at: 'content'. >> PNGReadWriter formFromStream: (Base64MimeConverter mimeDecodeToBytes: content readStream). > > Ah, great that you found a way to force the server to send the data in a more sensible way ! > > Using the latest code from Zn & NeoJSON, combining with another recent thread (accessing nested dictionaries), this could be written as: > > json := NeoJSONObject fromString: (ZnClient new > url: 'https://api.github.com/gists/5503544'; > accept: 'application/vnd.github.v3.base64+json'; > get). > b64 := json atPath: #('files' 'thumbnail.png' 'content'). > PNGReadWriter formFromStream: (ZnBase64Encoder new decode: b64) readStream. > > Sven > >> Peter >> >> >> On Wed, Apr 26, 2017 at 04:50:04PM +0200, Sven Van Caekenberghe wrote: >>> I am puzzled by how they actually encoded the PNG as a String, I tried a couple of alternatives but I could not get binary data out of it so that it parsed successfully as PNG. >>> >>> If I would have to encode binary data in JSON I would use Base64 encoding (but alternatives exist). >>> >>>> On 24 Apr 2017, at 20:36, Juraj Kubelka <juraj.kubelka(a)icloud.com> wrote: >>>> >>>> Hi, >>>> >>>> I was playing with GitHub Gist API and I have queried the following Gist: https://gist.github.com/mbostock/5503544 >>>> I was interested how the PNG image is returned: https://gist.github.com/mbostock/5503544#file-thumbnail-png >>>> >>>> I can obtain the whole Gist executing: >>>> >>>> STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get). >>>> >>>> I can get PNG contents executing: >>>> >>>> pngData := (ZnEasy get: >>>> ((((STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) contents. >>>> PNGReadWriter formFromStream: rawPng readStream. >>>> >>>> But the PNG image is part of the Gist query and can be retrieved by: >>>> >>>> pngContent := ((((STONJSON fromString: >>>> (ZnClient new >>>> url: 'https://api.github.com/gists/5503544'; >>>> accept: 'application/vnd.github.v3+json'; >>>> get)) at: 'files') at: 'thumbnail.png') at: 'content'). >>>> >>>> "As pngContent is a WideString, I cannot use:" >>>> PNGReadWriter formFromStream: pngContent readStream. >>>> >>>> How can I read the PNG image from the pngContent? Any idea? >>>> And the reverse question: How can I send the PNG bytes using JSON format? >>>> >>>> Thanks! >>>> Juraj >>>> >>> >>> >> > >

April 27, 2017

Re: [Pharo-users] Sending byte array in a JSON format

by Sven Van Caekenberghe

> On 26 Apr 2017, at 17:25, Peter Uhnak <i.uhnak(a)gmail.com> wrote: > > It is also possible that ZnEasy is doing some encoding transformations that breaks it; after all, you are retrieving binary data as text data, so encoding should be applied on it. JSON is text, using a specific encoding indeed. Since the JSON comes in and is parsed OK, it is safe to assume the textual decoding went fine. The problem is that the server sends binary data in a string without us knowing how it encoded them. That is why the base64 approach is better. > Peter > > On Wed, Apr 26, 2017 at 04:50:04PM +0200, Sven Van Caekenberghe wrote: >> I am puzzled by how they actually encoded the PNG as a String, I tried a couple of alternatives but I could not get binary data out of it so that it parsed successfully as PNG. >> >> If I would have to encode binary data in JSON I would use Base64 encoding (but alternatives exist). >> >>> On 24 Apr 2017, at 20:36, Juraj Kubelka <juraj.kubelka(a)icloud.com> wrote: >>> >>> Hi, >>> >>> I was playing with GitHub Gist API and I have queried the following Gist: https://gist.github.com/mbostock/5503544 >>> I was interested how the PNG image is returned: https://gist.github.com/mbostock/5503544#file-thumbnail-png >>> >>> I can obtain the whole Gist executing: >>> >>> STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get). >>> >>> I can get PNG contents executing: >>> >>> pngData := (ZnEasy get: >>> ((((STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) contents. >>> PNGReadWriter formFromStream: rawPng readStream. >>> >>> But the PNG image is part of the Gist query and can be retrieved by: >>> >>> pngContent := ((((STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get)) at: 'files') at: 'thumbnail.png') at: 'content'). >>> >>> "As pngContent is a WideString, I cannot use:" >>> PNGReadWriter formFromStream: pngContent readStream. >>> >>> How can I read the PNG image from the pngContent? Any idea? >>> And the reverse question: How can I send the PNG bytes using JSON format? >>> >>> Thanks! >>> Juraj >>> >> >> >

April 27, 2017

Re: [Pharo-users] Sending byte array in a JSON format

by Sven Van Caekenberghe

> On 26 Apr 2017, at 17:21, Peter Uhnak <i.uhnak(a)gmail.com> wrote: > > Maybe the content is not properly stored in the JSON on github' side? But you can use base64 in `accept:` to make it work. > > json := STONJSON fromString: (ZnClient new > url: 'https://api.github.com/gists/5503544'; > accept: 'application/vnd.github.v3.base64+json'; > get). > b64 := ((json at: 'files') at: 'thumbnail.png') at: 'content'. > PNGReadWriter formFromStream: (Base64MimeConverter mimeDecodeToBytes: content readStream). Ah, great that you found a way to force the server to send the data in a more sensible way ! Using the latest code from Zn & NeoJSON, combining with another recent thread (accessing nested dictionaries), this could be written as: json := NeoJSONObject fromString: (ZnClient new url: 'https://api.github.com/gists/5503544'; accept: 'application/vnd.github.v3.base64+json'; get). b64 := json atPath: #('files' 'thumbnail.png' 'content'). PNGReadWriter formFromStream: (ZnBase64Encoder new decode: b64) readStream. Sven > Peter > > > On Wed, Apr 26, 2017 at 04:50:04PM +0200, Sven Van Caekenberghe wrote: >> I am puzzled by how they actually encoded the PNG as a String, I tried a couple of alternatives but I could not get binary data out of it so that it parsed successfully as PNG. >> >> If I would have to encode binary data in JSON I would use Base64 encoding (but alternatives exist). >> >>> On 24 Apr 2017, at 20:36, Juraj Kubelka <juraj.kubelka(a)icloud.com> wrote: >>> >>> Hi, >>> >>> I was playing with GitHub Gist API and I have queried the following Gist: https://gist.github.com/mbostock/5503544 >>> I was interested how the PNG image is returned: https://gist.github.com/mbostock/5503544#file-thumbnail-png >>> >>> I can obtain the whole Gist executing: >>> >>> STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get). >>> >>> I can get PNG contents executing: >>> >>> pngData := (ZnEasy get: >>> ((((STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) contents. >>> PNGReadWriter formFromStream: rawPng readStream. >>> >>> But the PNG image is part of the Gist query and can be retrieved by: >>> >>> pngContent := ((((STONJSON fromString: >>> (ZnClient new >>> url: 'https://api.github.com/gists/5503544'; >>> accept: 'application/vnd.github.v3+json'; >>> get)) at: 'files') at: 'thumbnail.png') at: 'content'). >>> >>> "As pngContent is a WideString, I cannot use:" >>> PNGReadWriter formFromStream: pngContent readStream. >>> >>> How can I read the PNG image from the pngContent? Any idea? >>> And the reverse question: How can I send the PNG bytes using JSON format? >>> >>> Thanks! >>> Juraj >>> >> >> >

April 27, 2017

Re: [Pharo-users] improving audio/video quality of pharo days recordings

by Sean P. DeNigris

Peter Uhnak wrote > clip-on microphone Yes! Even a cheap lapel mic like the Sony ECM-CS3 would make a world of difference ----- Cheers, Sean -- View this message in context: http://forum.world.st/improving-audio-video-quality-of-pharo-days-recording… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

April 27, 2017