Using dask.compute with an array of delayed items


Using dask.compute with an array of delayed items



Currently, I can create (nested) lists of objects that are a mix of eagerly computed items and delayed items.



If I pass that list to dask.compute, it can create the graph and computes the result as a new list replacing the delayed items with their computed counterparts.


dask.compute



The list has a very well defined structure that I would like to exploit. As such, before using Dask, I had been using numpy array with dtype=object.


dtype=object



Can I pass these numpy arrays to dask.compute?
Are there other collections, that support ND slicing à la numpy, that I can use instead?


dask.compute



My current workaround is to either use dictionaries, or nested lists, but the ability to slice numpy arrays is really nice and I would not like to loose that.



Thanks,



Mark



code example as notebook




1 Answer
1



Dask.compute currently only searches through core Python data structures like lists and dictionaries. It does not search through Numpy arrays.



You might consider using Numpy arrays until the very end, then calling .tolist() then calling np.array again.


.tolist()



result = dask.compute(*x.tolist())
result = np.array(result)





great thanks, that was my workaround too, I just wanted to make sure I wasn't missing something.
– hmaarrfk
Jun 29 at 22:44





Do you have any plans to support numpy arrays in your nested packing and unpacking?
– hmaarrfk
Jun 29 at 23:17





Me personally? No I don't plan to work on this. If you are curious about the project then you should raise an issue.
– MRocklin
Jun 30 at 0:51





you included the dask team. I'll raise an issue on github. Thanks
– hmaarrfk
Jun 30 at 1:38






By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Comments

Post a Comment

Popular posts from this blog

paramiko-expect timeout is happening after executing the command

paramiko-expect timeout is happening after executing the command Can someone help me why timeout is happening after executing the command .I am trying to SSH to a machine and execute a command.I want to store the result of the executed command . I have referred paramiko-timeout but i didn't get my expected result. import traceback try: import paramiko except ImportError: raise Exception("Please install paramiko , pip install paramiko") import pexpect from paramiko_expect import SSHClientInteraction def main(): HOSTNAME = "minion5.net" USERNAME = "root" PASSWORD = "help@432" PROMPT = "root@*:~$s+" try: client = paramiko.SSHClient() client.load_system_host_keys() client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) client.connect(hostname=HOSTNAME, username=USERNAME, password=PASSWORD) with SSHClientInteraction(client, timeout=20, display=True) as interact: ...
Read more

Export result set on Dbeaver to CSV

Export result set on Dbeaver to CSV Normally I use Dbeaver for windows and always export my result set like this: run my query --> select the result --> export the result set --> select export to clipboard --> done This step by step puts my result set in my clipboard and I can paste it wherever I want to work with it. The problem is that now I am using dbeaver for mac and this guide is not working. I can go on until the moment that I select my result set like in the image below: exporting data set But once I go further in the process, in the last step I get: no query Note that in "source" it was suppose to show the query that originated the result set, but instead it says just "select. As a result it does't select my result or anything (besides being "successful"). Normally my query would show up there automatically and I couldn't find any option that corrects this problem in the menus. Please help me! Thanks. Aft...
Read more

Opening a url is failing in Swift

Opening a url is failing in Swift breakpointing inside the callback and logging success shows false. I added itms-apps to my plist: LSApplicationQueriesSchemes and put this in my app delegate: func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool { return true } func moreTapped() { let url = NSURL(string: "itms-apps://itunes.com/developer/quantum-productions/id979315877") if #available(iOS 10.0, *) { UIApplication.shared.open(url! as URL, options: [:], completionHandler: {(success: Bool) in }) } else { UIApplication.shared.openURL(url! as URL) } } Are you testing on a real device? – rmaddy Jun 21 at 23:57 I try on a device, get "Cannot Connect to App Store". Device is online ...
Read more