beam | The Framework for Modeling Behavior, Energy, Autonomy, and Mobility in Transportation Systems
kandi X-RAY | beam Summary
kandi X-RAY | beam Summary
BEAM stands for Behavior, Energy, Autonomy, and Mobility. The model is being developed as a framework for a series of research studies in sustainable transportation at Lawrence Berkeley National Laboratory. BEAM extend the Multi-Agent Transportation Simulation Framework (MATSim) to enable powerful and scalable analysis of urban transportation systems. try running BEAM with our simple getting started guide. check out the developer guide to get serious about power using or contributing.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of beam
beam Key Features
beam Examples and Code Snippets
def ctc_beam_search_decoder(inputs,
sequence_length,
beam_width=100,
top_paths=1,
merge_repeated=True):
"""Performs beam search decoding
Community Discussions
Trending Discussions on beam
QUESTION
I have dataflow pipeline, it's in Python and this is what it is doing:
Read Message from PubSub. Messages are zipped protocol buffer. One Message receive on a PubSub contain multiple type of messages. See the protocol parent's message specification below:
...
ANSWER
Answered 2021-Apr-16 at 18:49How about using TaggedOutput.
QUESTION
The Question
How do I best execute memory-intensive pipelines in Apache Beam?
Background
I've written a pipeline that takes the Naemura Bird dataset and converts the images and annotations to TF Records with TF Examples of the required format for the TF object detection API.
I tested the pipeline using DirectRunner with a small subset of images (4 or 5) and it worked fine.
The Problem
When running the pipeline with a bigger data set (day 1 of 3, ~21GB) it crashes after a while with a non-descriptive SIGKILL
.
I do see a memory peak before the crash and assume that the process is killed because of a too high memory load.
I ran the pipeline through strace
. These are the last lines in the trace:
ANSWER
Answered 2021-Jun-15 at 13:51Multiple things could cause this behaviour, because the pipeline runs fine with less Data, analysing what has changed could lead us to a resolution.
Option 1 : clean your input dataThe third line of the logs you provide might indicate that you're processing unclean data in your bigger pipeline mmap(NULL,
could mean that | "Get Content" >> beam.Map(lambda x: x.read_utf8())
is trying to read a null value.
Is there an empty file somewhere ? Are your files utf8 encoded ?
Option 2 : use smaller files as inputI'm guessing using the fileio.ReadMatches()
will try to load into memory the whole file, if your file is bigger than your memory, this could lead to errors. Can you split your data into smaller files ?
If files are too big for your current machine with a DirectRunner
you could try to use an on-demand infrastructure using another runner on the Cloud such as DataflowRunner
QUESTION
I have a Python Apache Beam streaming pipeline running in Dataflow. It's reading from PubSub and writing to GCS. Sometimes I get errors like "Error in _start_upload while inserting file ...", which comes from:
...ANSWER
Answered 2021-Jun-14 at 18:49In a streaming pipeline, Dataflow retries work items running into errors indefinitely.
The code itself does not need to have retry logic.
QUESTION
Well, the title says it all: I'm wondering what is the reason why the BEAM doesn't garbage collect atoms. I'm aware of question How Erlang atoms can be garbage collected but, while related, it doesn't reply to why.
...ANSWER
Answered 2021-Jun-12 at 20:42Because that is not possible (or at least very hard) to do in the current design. Atoms are important part of:
- modules, as module names are atoms
- function names, which also are atoms
- distributed Erlang also extensively use atoms
Especially last point makes it hard. Imagine for second that we would have a GC for atoms. What would happen if there would be a GC cleanup in between the distributed call where we send some atoms over the wire? All of that makes atoms quite essential to how VM works and making them GCed would not only make implementation of VM much more complex, it would also make code much slower as atoms do not need to be copied between processes and as these aren't GCed, these can be completely omitted in GC mark step.
QUESTION
I'm new to beam so the whole triggering stuff really confuse me.
I have files that are uploaded regularly to gcs to a path that looks something like this: node-///files_parts
and I need to write something that would trigger when all 8 parts of a file exist.
Their names are something like that: file_1_part_1, file_1_part_2, file_2_part_1, file_2_part_2
(there could be multiple files parts in the same dir but if its a problem I could ask for it to change).
Is there any way to create this trigger? and if not what do you suggest I could do instead?
Thanks!
...ANSWER
Answered 2021-Jun-09 at 17:35If you are using the Java SDK, you can use a transform Watch to achieve this. I don't see a counterpart in the Python SDK though.
I think it's better to write a program polling the files in the GCS directory. When 8 parts of a file is available, publish a message containing the file name to Pub/Sub or similar product.
Then in your Beam pipeline, use the Pub/Sub topic as the streaming source to do your ETL.
QUESTION
I'm trying to make a simple puzzle system for a game involving beams of light and mirrors in Unity. The light beams are created using an empty GameObject that casts a Raycast2D and uses a LineRenderer to display the beam. When a beam collides with a mirror object I simply use Vector2.Reflect
to calculate the new direction.
The implementation works fine when the mirrors are static. When I try to move them around in-game, it causes random stack overflow errors, and there doesn't seem to be a pattern. Here's an example of a working mirror setup:
Here's what happens when I try to move a mirror:
I'm guessing it's due to the mirror somehow reflecting the beam back and causing an infinite reflection loop, but I'm not sure why that would happen.
Relevant code:
...ANSWER
Answered 2021-Jun-09 at 11:15If the condition if(hit.collider.gameObject.tag == "Mirror")
is not met, you are doing a lightPoints.Add(hit.point);
and upadting the beam, adding points to the LineRenderer
component position array also. That does not seem a good idea, as presumably you will get to the point when the ray does not hit anymore. As is, once you get to that point you keep on adding points, leading to the stack overflow.
I would add some safegard condition, where you stop adding points to your lists/arrays if you dont hit a gamobject of interest, maybe a determined ray length, or a condition that avoids the point to be added if the ray does not hit.
I checked the line of the error you are having in the script itself with not very revaling info. But you got the script there in case that helps.
QUESTION
I am trying to run a beam job on dataflow using the python sdk.
My directory structure is :
...ANSWER
Answered 2021-Jun-08 at 09:22Probably the wrapper-runner script generated by Bazel (you can find path to it by calling bazel build
on a target) restrict set of modules available in your script. The proper approach is to fetch PyPI dependencies by Bazel, look at example
QUESTION
I'm using Apache Beam 2.28.0 on Google Cloud DataFlow (with Scio SDK). I have a large input PCollection
(bounded) and I want to limit / sample it to a fixed number of elements, but I want to start the downstream processing as soon as possible.
Currently, when my input PCollection
has e.g. 20M elements and I want to limit it to 1M by using https://beam.apache.org/releases/javadoc/2.28.0/org/apache/beam/sdk/transforms/Sample.html#any-long-
ANSWER
Answered 2021-Jun-08 at 13:40OK, so my initial solution for that is to use Stateful DoFn like this (I'm using Scio's Scala SDK as mentioned in the question):
QUESTION
I am trying to change Model names in Abaqus with respect to the values in an array list. At first, I created two array lists and divided them but it is not a good idea as I will have 100 values later on in Beam_h and Beam_w and the values will repeat.. What can I do if I want to have my model names be: model20-10
, model30-10
, model50-10
? Also, the loop I used so far gives me model0
, model1
, model2
. What to write in the loop to get desired model names?
ANSWER
Answered 2021-Jun-07 at 02:01I think, you just need to figure out string concatenation
.
You need to check for duplicate model names as well. Because Abaqus replaces the already existing model if you create a model with duplicate name.
To address this issue, you can use dictionary
object in following way:
QUESTION
I am having a process which creates feed to external systems which is having a multi character delimiter. The data itself have some json document as columns. I amusing spark 2.3 , yet to upgrade to higher version
...ANSWER
Answered 2021-Jun-04 at 18:02First of all, you shouldn't save it as CSV if you don't actually use CSV's features, or its features would drive you nuts. Instead, you can save as a plain text file with the header prepended into original dataframe.
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