This documentation is for the older Mesmerize legacy desktop application. Please see the home page or GitHub repo for information on the latest packages.


Perform CNMF using the implementation provided by the CaImAn library. This modules basically provides a GUI for parameter entry.

I highly recommend going through the following before using this module



Please see the CaImAn demo notebook mentioned above to understand the parameters. The Caiman docs also provide descriptions of the parameters:

You can also enter parameters for CNMF and component evaluation as keyword arguments (kwargs) in the the respective text boxes if you select “Use CNMF kwrags” or “Use evaluation params”. This is useful if you want to enter parameters that cannot be entered in the GUI for example. Use single quotes if you want to enter string kwargs, do not use double quotes.


This module adds a “CNMF” item to the batch. Set the desired parameters (see Caiman docs & demos) and then enter a name to add it as an item to the batch. After the batch item is processed, double-click the batch item to import the CNMF output into a Viewer. You can then annotate and curate ROIs, and add the data as a Sample to your project.

See also

This modules uses the Batch Manager.


It’s recommended to open a new Viewer when you want to import 3D CNMF data. Full garbage collection of 3D data in the Viewer Work environment is a WIP for when you want to clear & import 3D data into the same viewer. However when you close the Viewer entirely it is garbage collected entirely.


The parameters used for CNMF are stored in the work environment of the viewer and this log is carried over and saved in Project Samples as well. To see the parameters that were used for CNMF in the viewer, execute get_workEnv().history_trace in the viewer console and look for the ‘cnmf’ entry.


Importing several thousands of ROIs into the Viewer can take 15-30 minutes. You will be able to track the progress of the import in the Viewer Window’s status bar.


If you’re using Windows, large memmap files will linger in your batch dir or work dir, you can clean them out periodically.

Script usage

A script can be used to add CNMF batch items. This is much faster than using the GUI. This example sets the work environment from the output of a batch item. See the Caiman Motion Correction script usage examples for how to load images if you want to add CNMF items from images that are not in a batch.

See also

Script Editor

def reset_params():
    # CNMF Params that we will use for each item
    cnmf_kwargs = \
        'p': 2,
        'gnb': 1,
        'merge_thresh': 0.25,
        'rf': 70,
        'stride': 40,
        'k': 16,
        'gSig': (8, 8),
        'gSiz': (33, 33)

    # component evaluation params
    eval_kwargs = \
        'min_SNR': 2.5,
        'rval_thr': 0.8,
        'min_cnn_thr': 0.8,
        'cnn_lowest': 0.1,
        'decay_time': 2.0,

    # the dict that will be passed to the mesmerize caiman module
    params = \
        "cnmf_kwargs":  cnmf_kwargs,
        "eval_kwargs":  eval_kwargs,
        "refit":        True,  # if you want to perform a refit
        "item_name":    "will set later per file",

    return params

# Get the batch manager
bm = get_batch_manager()
cnmf_mod = get_module('cnmf', hide=True)

# Start index if we want to start processing the new items after they have been added
start_ix = bm.df.index.size + 1

# This example uses motion corrected output items from the batch manager
# You can also open image files directly from disk, see the motion correction
# script examples to see how to open images from disk.
for ix, r in bm.df.iterrows():
    # Use output of items 6 - 12
    # for example if items 6 - 12 were motion correction items
    if ix < 6:
    if ix > 12: # You need to set a break point, else the batch grows infinitely

    # get the first variant of params
    params = reset_parmas()

    # Get the name of the mot cor item
    name = r['name']

    # Set the name for the new cnmf item
    params['item_name'] = name

    # Load the mot cor output
    bm.load_item_output(module='caiman_motion_correction', viewers=viewer, UUID=r['uuid'])

    # Set the sampling rate of the data
    params['eval_kwargs']['fr'] = vi.viewer.workEnv.imgdata.meta['fps']

    # Get the border_pix value from the motion correction output
    # skip this if loading files that don't have NaNs on the image borders
    history_trace = vi.viewer.workEnv.history_trace
    border_pix = next(d for ix, d in enumerate(history_trace) if 'caiman_motion_correction' in d)['caiman_motion_correction']['bord_px']

    # Set the border_pix values
    params['border_pix'] = border_pix
    params['cnmf_kwargs']['border_pix'] = border_pix

    # Add to batch

    # change some of the params and add this variant to batch
    params['cnmf_kwargs']['gSig'] = (10, 10)
    params['cnmf_kwargs']['gSiz'] = (41, 41)

    # Add to batch with this params variant

    # another parameter variant
    params['eval_kwargs']['rval_thr'] = 0.7
    params['eval_kwargs']['min_cnn_thr'] = 0.65

    # Add to batch with this params variant

# Cleanup the work environment

# Uncomment the last two lines to start the batch as well
#bm.process_batch(start_ix, clear_viewers=True)