Holoviews streaming data. Although HoloMaps are useful for exploring high .

Holoviews streaming data Like all objects in HoloViews, these parameters are declared using param and streams are defined as a parameterized subclass of the holoviews. image module holoviews. The accumulated data is then made available via the data parameter. Declaring Buffer will accumulate the last N rows, where N is defined by the specified length. A HoloViews stream is simply a parameter of a corresponding stream class configured to track some variable, typically reflecting some user interaction. The streamz. Feb 27, 2021 · Hi, Is there a way to configure a holoviews streaming plot to keep up with live-data (change x1), but not force x0, or the y-range to change (or only change the y-range if a new min/max is reached)? I want to be able t… 5 days ago · With a live Python server and the Bokeh backend, HoloViews can also be used to build highly customized interactive displays using DynamicMap and the streams system. I came up with the following example, put together using examples from https://holoviews. However, as you’ve already noted, we’d preferably be able to patch data as well. g. 8 with python 3. Jan 27, 2025 · Meanwhile, libraries like Bokeh and HoloViews stand out as the best data visualization tools in Python 2025 for scaling and visualizing large or streaming datasets, making Python a leader in data visualization innovation. 15. curdoc, the callback is never called and if I add the periodic Nov 2, 2023 · The best way is to probably stick to the HoloViews documentation and use Pipe for updating all data, and Buffer for append-only. Not streaming data record by record but a new dataset. callbacks. Aug 5, 2019 · The streamz and hvplot packages work together to provide support for plotting streaming data using pandas dataframes. Callback(plot, streams, source, **params) [source] # Bases: object Provides a baseclass to define callbacks, which return data from bokeh model callbacks, events and attribute changes. It is quite similar to a Stream as it allows defining callbacks in response to some change or event on the source object, however, unlike a Stream, it does not transfer data and make it available to user defined subscribers. Dataset from multiple NetCDF files I would like to provide some examples on how to start streams in Panel. In exploring new technologies and tools within the data visualization and dashboard creation space, my curiosity is continually drawn to Holoviews and Panel. in BoundsX — HoloViews v1. grid module holoviews. I want to display rolling values etc. How does one update a plot within the main section of a template layout ? Here is a short version Nov 10, 2025 · Each of these linked Stream types has a corresponding backend specific Callback, which defines which plot attributes or events to link the stream to and triggers events on the Stream in response to changes on the plot. In the following, we will again use our Cologne bike rental data to demonstrate DataShader’s abilities. Timestamp. The data contains the incidence of measles across US states by year and week (obtained from Project Tycho). dictionary module holoviews. When streaming a DataFrame will reset the DataFrame index by default making it available to HoloViews elements as dimensions, this may be disabled by setting index=False. For example, the streamz package has a convenience utility for creating a random Dec 6, 2024 · Data Source Flexibility: Stream data from LSL-compatible neural and physiological sensors. io. My new backend Nov 10, 2025 · import pandas as pd import panel as pn import psutil import holoviews as hv from holoviews import dim, opts hv. So let’s say you have pn. My trails always ran into errors. Once your data is in such containers, individual visualizations are then made by choosing Advanced Dashboards # At this point we have learned how to quickly build visualizations with hvPlot, how to build interactive apps and dashboards with Panel, and how to add custom interactivity by using HoloViews. We would like to show you a description here but the site won’t allow us. Aug 24, 2019 · 3 I'm using Datashader to make crossplots of different parameters due to the quantity of data I'm working with. The core concept behind a stream is simple: it defines one or more parameters that can change over time that automatically refreshes code depending on those parameter values. Nov 10, 2025 · Indexing and Selecting Data # As explained in the Building composite objects and Dimensioned Containers guides, HoloViews allows building up hierarchical containers that express the natural relationships between data items, in whatever multidimensional space best characterizes the application domain. Apr 1, 2022 · Another bug, maybe more Panel than Holoviews: when using responsive=True on a Holoviews plot, it seems to want to take up the entire space of of the container. Jun 25, 2025 · holoviews. The HeatMap represents the mean measles incidence per year. BoundsX(linked=True, popup=None, popup_position='top_right', popup_anchor=None, **params) [source] # Bases: LinkedStream A stream Nov 10, 2025 · Interactive Hover for Big Data Use the selector with Datashader to enable fast, interactive hover tooltips that reveal individual data points without sacrificing aggregation. To see what streams are available, I check out the HoloViews Reference Gallery. Bar point, hv. I’m trying to get this working. Let me know. ipynb · GitHub Video of it running: Imgur: The magic of the Internet I wonder if repeatedly creating the plot objects each time my plot function is Mar 25, 2024 · Now that we have a foundation, we can attach a stream to the plo to allow users to interact with the plot. I would like to calculate the mean value of a time series from a data stream. Jun 14, 2022 · I’m trying to visualize data from pyBullet using Holoview’s streaming functions. Plotting The plotting interface on streamz DataFrame and Series objects attempts to mirror the pandas plotting API, but instead of plotting with matplotlib uses HoloViews to generate dynamically streaming bokeh plots. total, used=vmem. Aug 9, 2023 · This presents me with an opportunity to finally explore Holoviews and Panel using some high-frequency real-time sensor data. Other Streamz Blog Jul 3, 2025 · I'm porting a Panel app to Marimo, which so far turns out much simpler than the old code but for plotting I'm using Holoviews plots with streaming and downsampling which don't appear to work. used/vmem. I looked at this post from Marc: Panel - starting a stream of data Setting meta_refresh works but is not ideal for my case where the updated plot data comes from a HTTP request. I wonder if Holoviews Selection1D stream is compatible with datashader. add_periodic_callback Streaming from a separate thread. Defining custom Stream and Callback types will be covered in future guides. core Base classes implementing the core data structures of HoloViews. " Sep 29, 2025 · Module Structure # HoloViews subpackages # annotators Helper functions and classes to annotate visual elements. Image s and Curve s) that you can easily select and visualize. dask module holoviews. We recommend reading this guide in order if you wish to get an overview of what is offered by HoloViews. core. ipython Interface to IPython notebook, including magics Mar 24, 2022 · I’m using holoviews version 1. Feb 28, 2020 · Hi, Maybe a stupid question but does the holoviews dynamic mapping of streaming dataframes from streamz works with non-time series type data ? Thanks, Principles of datashading # Because HoloViews elements are fundamentally data containers, not visualizations, you can very quickly declare elements such as Points or Path containing datasets that may be as large as the full memory available on your machine (or even larger if using Dask dataframes). stream (from Bokeh) in a callback function that should be periodically called. Row(foo, holoview) then holoview will take on the size of the whole row, and because of foo, become larger than the available space. py to open a new browser window for streaming. Nov 10, 2025 · Title: HeatMap Tap stream example # Description: A linked streams example demonstrating how use Tap stream on a HeatMap. DynamicMap Nov 22, 2024 · Custom Interactivity # Using hvPlot allows you to generate a number of different types of plot quickly from a standard API by building HoloViews objects, as discussed in the previous notebook. streams. free/vmem. """ An example app demonstrating how to use the HoloViews API to generate a bokeh app with complex interactivity. Thanks. streams import Buffer, Pipe i… Aug 16, 2022 · Hello everyone. 0. Many other modes of interactivity are possible when building Mar 24, 2022 · I suspect that this example is pretty old, which is why it does not work anymore. Is it possible at all? Do I have to use another approach, e. For more information on DynamicMap and HoloViews dynamic plotting support, see the HoloViews User A source for the linking may be supplied to the constructor in the form of another viewable object specifying which part of a plot the data should come from. Aug 29, 2025 · Streaming # hvPlot supports streamz DataFrame and Series objects, automatically generating streaming plots in a Jupyter notebook or deployed as a Bokeh Server app. In this section we will work on putting all of this together to build complex and efficient data processing pipelines, controlled by Panel widgets. If you know of more. In this guide we will discover how to combine dynamic data with operations to declare lazy and declarative data processing pipelines, which can be used for interactive exploration but can also drive complex dashboards or even bokeh apps. This manual will provide a general Nov 4, 2025 · Welcome to HoloViews! # This ‘Getting Started’ guide aims to get you using HoloViews productively as quickly as possible. Nov 10, 2025 · Selection Stream # Download this script from GitHub (right-click to download). use the bokeh API → selection Module — HoloViews v1. 14. data Data Interface classes allowing HoloViews to work with different types of data. Contribute to holoviz/holoviews development by creating an account on GitHub. state. What’s maybe not so well-known is that DynamicMap also supports param objects as streams. Here’s my code: import streamz import holoviews as hv from holoviews. I’ve compiled the below. Linking streams to plots # Nov 10, 2025 · What is a Link? # A Link defines some connection between a source and target object in their visualization. Nov 10, 2025 · Interactive Hover for Big Data Use the selector with Datashader to enable fast, interactive hover tooltips that reveal individual data points without sacrificing aggregation. The essence of a HoloMap is that it contains a collection of Elements (e. So even for very large datasets, you can easily specify a data structure that you can work with Jul 24, 2020 · Hi everyone, I am trying to use the streaming capabilities of Bokeh in combination with the Panel library. html and http://holovi Nov 10, 2025 · With a live Python server and the Bokeh backend, HoloViews can also be used to build highly customized interactive displays using DynamicMap and the streams system. With Holoviews, your data visualizes itself. Resources HoloViz HoloViews Streaming Data Guide Streaming psutil Panel Panel Streamz Guide Async and Concurrency. Stream. Image objects (160x512), and each update is taking ~68ms (14fps). interface module holoviews. core. HoloViews is a popular and powerful data visualization library supporting many data and plotting backends. . dataframe module provides a Random utility that generates a StreamingDataFrame that emits random data with a certain frequency at a specified interval. Although HoloMaps are useful for exploring high With the StreamingDataFrame we can easily stream data, apply computations such as cumulative and rolling statistics and then visualize the data with HoloViews. For detailed Nov 10, 2025 · Bases: Callback A Stream callback that syncs the data on a bokeh ColumnDataSource model with Python. After some time I figured out that I can use a function as input to the DynamicMap and not just a HoloViews plot element. As Jan 4, 2023 · Hi, I’m seeing slow performance with streaming data. Working with Streaming Data Demonstrates how to leverage the streamz library with HoloViews to work with streaming datasets. All hvPlot methods on streamz objects return HoloViews DynamicMap objects that update the plot whenever streamz triggers an event. These objects are rendered with Bokeh, which offers a number of standard ways to interact with your plot, such as panning and zooming tools. The transient option allows treating stream events as discrete updates, resetting the parameters to their default after the stream has been triggered. Real-Time Visualization: Periodic updates and dynamic axis adjustments to preserve amplitude context during monitoring. 18. Each update is displaying 1 hv. It is designed as an entry point for new users that will introduce the core concepts necessary to get you working productively with your own data. Creating interactive dashboards Use external widget libraries to build custom, interactive dashboards. This seems related to #979 but it seems maybe more stuff is needed to make streaming work. Jan 11, 2021 · I think this is because the stream is empty upon initialization and only receives data after user interaction, but as I said, datashade is able to handle this but spread is not. streams module # The streams module defines the streams API that allows visualizations to generate and respond to events, originating either in Python on the server-side or in Javascript in the Jupyter notebook (client-side). now()]) return df Mar 20, 2024 · Explores a 4D dataset (time, level, lat, lon) dataset using HoloViews and Panel. 0 Can spread be made to work on streaming data that is empty upon initialization? Aug 18, 2023 · Hey there, on an attempt to create a responsive plot with two VLine elements, I’ve discovered the option to use streams. However, while exploring streaming for my use case, I fail to correctly create a hv. The HoloMap is a core HoloViews data structure that allows easy exploration of parameter spaces. Panel, HoloViews, hvPlot and GeoViews are all members of the HoloViz ecosystem and you can expect them to work perfectly together. In this reference notebook we will assume a basic Live Data # The HoloMap is a core HoloViews data structure that allows easy exploration of parameter spaces. Simple “Streaming” using meta_refresh Streaming using pn. More specifically, I am trying to use ColumnDataSource. multipath module Mar 20, 2021 · Hello! I am working with Bokeh and would like to draw a set if Pie charts upon Image in DynamicMap pipe = Pipe(data=) Image = hv. total), index=[pd. HoloMaps hold fully constructed Elements at specifically sampled points in a multidimensional space. I want the streams to be updated in real time and to be rendered in a web browser window. Aug 22, 2021 · Motivated by a few posts by @fishing Streams from Xarray? - #2 by fischcheng Button to refresh loaded Xarray. 0? Example: import pandas as pd import 5 days ago · Interactive Hover for Big Data Use the selector with Datashader to enable fast, interactive hover tooltips that reveal individual data points without sacrificing aggregation. Nov 10, 2025 · In the previous guides we discovered how to load and declare dynamic, live data and how to transform elements using dim expressions and operations. virtual_memory() df = pd. extension('bokeh') Nov 2, 2023 · I’m trying to create a streaming application using HoloViews and the Buffer. Nov 10, 2025 · holoviews. Putting the holoview inside its own row or column seems to fix the problem. I have Holoviews version 1. Image, streams=[pipe]) Could you provide any tips on how to work around it, please? Aug 15, 2019 · HoloViews’ support for Datashader makes plotting millions of data points pretty easy, even while maintaining interactivity. 0 where the Buffer is described. Nov 10, 2025 · Bases: Parameterized A Link defines some connection between a source and target object in their visualization. From another thread, I found that I need to use the command panel serve --show filename. However, I do not manage to make this work: if I add the periodic callback to the bokeh. It is quite similar to a Stream as it allows defining callbacks in response to some change or event on the source object, however, unlike a Stream, it does not transfer data between the browser and a Python process. element Elements that form the basis of more complex visualizations. Feb 9, 2021 · I’ve been creating a demo of Streaming with HoloViz for work and I would like to include links to great examples and resources. "As you can see, streaming data works like streams in HoloViews in general, flexibly handling changes over time under either explicit control or governed by some external data source. Uses a Selection1D stream to compute the mean y-value of the current selection. org/user_guide/Streaming_Data. HoloViews makes it very easy to customize existing plots, or even create completely novel plots. Luckily I could get it to work by updating the example to the following: import datetime as dt import psutil import pandas as pd import holoviews as hv import panel as pn from holoviews import dim, opts hv. So here’s my code so far: import pybullet as p import time import pybullet_data We would like to show you a description here but the site won’t allow us. Nov 10, 2025 · Working with Streaming Data # import time import numpy as np import pandas as pd import holoviews as hv from holoviews import opts from holoviews. DynamicMap(hv. Nov 10, 2025 · Working with Plot and Renderers # HoloViews ordinarily hides the plotting machinery from the user. streams import Buffer, Pipe hv. To support plotting streaming data you can use this interface either in a Jupyter notebook or deploy it as a bokeh server app. 9 from recent anaconda distribution and are trying to run the galery examples which works fine in principle. extension("bokeh") # Define functions to get memory and CPU usage def get_mem_data(): vmem = psutil. data. class holoviews. So far I could only find examples using a static curve as a source, e. Panel has made some efforts to create custom Param classes with stream & patch events. My idea is to enable some kind of interaction that allows the user to select directly from the plot, the outliers based on the data's tendency showed these ones. visualize (filename) Streaming data can be visualized using the optional separate packages hvPlot, HoloViews, and Panel (see below) Working with large data Leverage Datashader to interactively explore millions or billions of datapoints. Creating interactive dashboards Jan 13, 2023 · I am trying to update a plot at regular intervals with new data. Demo notebook with dummy data: Benchmark-Live-Holoviews. Creating interactive dashboards The network graph underlying a stream can be visualized using dot to render a PNG using Stream. ibis module holoviews. virtual Demonstrates how to leverage the streamz library with HoloViews to work with streaming datasets. bokeh. Jun 7, 2022 · Hi, I’m trying to plot a dynamic map from PyCharm and render it in a new browser window. This allows for very quick iteration over different visualizations to explore a dataset, however it is often important to customize the precise details of a plot. hvPlot (quick viz) and GeoViews (spatial viz) are built on top of HoloViews and produces HoloViews objects. DataFrame(dict(free=vmem. Curve (160 points) / hv. Note it’s in the current master branch, but not released yet. Then I want to combine with widgets Jun 11, 2019 · I want to stream data generated by python to a webpage. Interactive Controls: Buttons with state-based styling to start, pause, and stop data streams. Instead of using a method that re-creates the plot and overlays new VLines, every time I change the value for my VLines, I expect streaming to result in better responsiveness. Creating interactive dashboards 5 days ago · As you can see, streaming data works like streams in HoloViews in general, flexibly handling changes over time under either explicit control or governed by some external data source. The resources to get me started is Working with Streaming Data — HoloViews v1. plotting. Although HoloMaps are useful for exploring high-dimensional With Holoviews, your data visualizes itself.