Can I export a tensorflow summary to CSV?

While the answer here is as requested within tensorboard it only allows to download a csv for a single run of a single tag. If you have for example 10 tags and 20 runs (what is not at all much) you would need to do the above step 200 times (that alone will probably take you more than a hour). If now you for some reason would like to actually do something with the data for all runs for a single tag you would need to write some weird CSV accumulation script or copy everything by hand (what will probably cost you more than a day).

Therefore I would like to add a solution that extracts a CSV file for every tag with all runs contained. Column headers are the run path names and row indices are the run step numbers.

import os
import numpy as np
import pandas as pd

from collections import defaultdict
from tensorboard.backend.event_processing.event_accumulator import EventAccumulator


def tabulate_events(dpath):
    summary_iterators = [EventAccumulator(os.path.join(dpath, dname)).Reload() for dname in os.listdir(dpath)]

    tags = summary_iterators[0].Tags()['scalars']

    for it in summary_iterators:
        assert it.Tags()['scalars'] == tags

    out = defaultdict(list)
    steps = []

    for tag in tags:
        steps = [e.step for e in summary_iterators[0].Scalars(tag)]

        for events in zip(*[acc.Scalars(tag) for acc in summary_iterators]):
            assert len(set(e.step for e in events)) == 1

            out[tag].append([e.value for e in events])

    return out, steps


def to_csv(dpath):
    dirs = os.listdir(dpath)

    d, steps = tabulate_events(dpath)
    tags, values = zip(*d.items())
    np_values = np.array(values)

    for index, tag in enumerate(tags):
        df = pd.DataFrame(np_values[index], index=steps, columns=dirs)
        df.to_csv(get_file_path(dpath, tag))


def get_file_path(dpath, tag):
    file_name = tag.replace("/", "_") + '.csv'
    folder_path = os.path.join(dpath, 'csv')
    if not os.path.exists(folder_path):
        os.makedirs(folder_path)
    return os.path.join(folder_path, file_name)


if __name__ == '__main__':
    path = "path_to_your_summaries"
    to_csv(path)

My solution builds upon: https://stackoverflow.com/a/48774926/2230045

---

EDIT:

I created a more sophisticated version and released it on GitHub: https://github.com/Spenhouet/tensorboard-aggregator

This version aggregates multiple tensorboard runs and is able to save the aggregates to a new tensorboard summary or as a .csv file.

Here is my solution which bases on the previous solutions but can scale up.

import os
import numpy as np
import pandas as pd

from collections import defaultdict
from tensorboard.backend.event_processing.event_accumulator import EventAccumulator


def tabulate_events(dpath):

    final_out = {}
    for dname in os.listdir(dpath):
        print(f"Converting run {dname}",end="")
        ea = EventAccumulator(os.path.join(dpath, dname)).Reload()
        tags = ea.Tags()['scalars']

        out = {}

        for tag in tags:
            tag_values=[]
            wall_time=[]
            steps=[]

            for event in ea.Scalars(tag):
                tag_values.append(event.value)
                wall_time.append(event.wall_time)
                steps.append(event.step)

            out[tag]=pd.DataFrame(data=dict(zip(steps,np.array([tag_values,wall_time]).transpose())), columns=steps,index=['value','wall_time'])

        if len(tags)>0:      
            df= pd.concat(out.values(),keys=out.keys())
            df.to_csv(f'{dname}.csv')
            print("- Done")
        else:
            print('- Not scalers to write')

        final_out[dname] = df


    return final_out
if __name__ == '__main__':
    path = "youre/path/here"
    steps = tabulate_events(path)
    pd.concat(steps.values(),keys=steps.keys()).to_csv('all_result.csv')

Just check the "Data download links" option on the upper-left in TensorBoard, and then click on the "CSV" button that will appear under your scalar summary.