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Example with 'mlbench':
install.packages('mlbench', dependencies=TRUE, repos='http://cran.rstudio.com/')

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Start a screen session:
screen -S "vgg-regression"

To detach a screen session:
Ctrl-a d

To reattach the only screen session
Ctrl-a r

To reattach a session of given PID

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interactive -c 24 -t 08:00:00

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```python
import collections , yaml

_mapping_tag = yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG

def dict_representer(dumper, data):
  return dumper.represent_mapping(_mapping_tag, data.iteritems())

def dict_constructor(loader, node):
  return collections.OrderedDict(loader.construct_pairs(node))

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sudo apt-get install moreutils
expand -t 4 filein | sponge fileout

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Load image.
Duplicate it as many times as many types of ROI you want to draw.
GO --> Edit --> Selection --> Add to Manager.
Draw the ROI and add it to the manager.
Click on each ROI / each group of ROIs and then click "More" --> "Fill" inside the manager.
Save the resulting image as separate .png.

In case you want to work with the .roi format of ImageJ, use this python code to read the .zip and the .roi:
                https://gist.githubusercontent.com/luispedro/3437255/raw/d3f0be5efbe37efe27946c5fa21f5ef523cdac43/readroi.py

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From \t to 4 spaces:
find . -type f -exec sed -i.orig 's/\t/    /g' {} +

From 4 spaces to \t:
find . -type f -exec sed -i.orig 's/    /\t/g' {} +

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history
Ctrl+R
Type the subject of your search, e.g. screen
Type Ctrl+R repeatedly until you find your match.

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merged = df1.merge(df2, indicator=True, how='outer')
merged[merged['_merge'] == 'left_only']

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Find unique values within a specified column of a CSV with semicolor delimiter: csvcut -c SCATPC -d ";" /pstore/data/pio/Tasks/PIO-382/original_tables/table_scatpc.csv | sed 1d | sort | uniq