multielectrode_grasp/code/convert_to_nix.py

"""
This script loads a complete session in the blackrock format and converts it to a single nix file
"""
import os

import numpy as np
import quantities as pq

import neo
from neo.test.tools import (assert_same_sub_schema,
                            assert_same_annotations,
                            assert_same_array_annotations)
from elephant.signal_processing import butter

from reachgraspio import reachgraspio


# Choose which session you want to convert into a nix file
session = "i140703-001"
# session = "l101210-001"

# Input data. i.e., original Blackrock files and odML
dataset_dir = '../datasets_blackrock'
session_path = f'{dataset_dir}/{session}'
odml_dir = os.path.join('..', 'datasets_blackrock')

# Output for the nix files
nix_dataset_dir = '../datasets_nix'
nix_session_path = f'{nix_dataset_dir}/{session}'


##### LOAD BLACKROCK FILES ############
session = reachgraspio.ReachGraspIO(
    filename=session_path,
    odml_directory=odml_dir,
    verbose=False)

block = session.read_block(lazy=False, load_waveforms=True)

# =============================================================================
# Create offline filtered LFP
#
# Here, we construct one offline filtered LFP from each ns5 (monkey L) or ns6
# (monkey N) raw recording trace. For monkey N, this filtered LFP can be
# compared to the LFPs in the ns2 file (note that monkey L contains only
# behavioral signals in the ns2 file). Also, we assign telling names to each
# Neo AnalogSignal, which is used for plotting later on in this script.
# =============================================================================

nsx_to_anasig_name = {2: 'LFP signal (online filtered)',
                      5: 'raw signal',
                      6: 'raw signal'}

# this factor was experimentally determined as an approximate shift introduced
# by the online filtering. Here, we integrate this shift such that the offline
# filtered signal is aligned to the online filtered signal (if that were
# available)
time_shift_factor = -0.42*pq.ms

filtered_anasig = None
raw_anasig = None

# identify neuronal signals and provide labels for plotting
for anasig in block.segments[0].analogsignals:
    # skip non-neuronal signals
    if not anasig.annotations['neural_signal']:
        continue

    # identify nsx source of signals in this AnalogSignal object
    if 'nsx' in anasig.annotations:
        nsx = anasig.annotations['nsx']
    else:
        nsx = np.unique(anasig.array_annotations['nsx'])
        assert len(nsx) == 1, 'Different nsx sources in AnalogSignal'
        nsx = nsx[0]

    if nsx == 2:
        # AnalogSignal is LFP from ns2
        filtered_anasig = anasig
    elif nsx in [5, 6]:
        # AnalogSignal is raw signal from ns5 or ns6
        raw_anasig = anasig

if filtered_anasig is None:
    print("Filtering raw time series to obtain LFP")
    for f in range(raw_anasig.shape[1]):
        # filtering must be done channel by channel for memory reasons (requires approx. 32 GB RAM)
        print(f"Processing channel {f}")

        filtered_signal = butter(
            raw_anasig[:, f],
            highpass_freq=None,
            lowpass_freq=250 * pq.Hz,
            filter_function='sosfiltfilt',
            order=4)

        downsampled_signal=filtered_signal.downsample(30).time_shift(time_shift_factor)

        # first run? Create a new Analogsignal
        if f == 0:
            offline_filtered_anasig = neo.AnalogSignal(
                np.zeros((downsampled_signal.shape[0], raw_anasig.shape[1])) *\
                    downsampled_signal.units,
                t_start=downsampled_signal.t_start,
                sampling_rate=downsampled_signal.sampling_rate)

        offline_filtered_anasig[:, f] = downsampled_signal

    if 'nsx' in anasig.annotations:
        nsx = anasig.annotations['nsx']
    else:
        nsx = anasig.array_annotations["nsx"][0]

    offline_filtered_anasig.name = f"NeuralTimeSeriesDownsampled"
    offline_filtered_anasig.description = "Downsampled continuous neuronal recordings, where the downsampling was " \
                           "performed off-line during post-processing"

    # Attach all offline filtered LFPs to the segment of data
    block.segments[0].analogsignals.append(offline_filtered_anasig)


##### SAVE NIX FILE ###################
nix_filename = nix_session_path + '.nix'
if os.path.exists(nix_filename):
    print('Nix file already exists and will not be overwritten.')
else:
    with neo.NixIO(nix_filename) as io:
        print(f'Saving nix file at {nix_filename}')
        io.write_block(block)

##### VALIDATION OF FILE CONTENT ######
with neo.NixIO(nix_filename, mode='ro') as io:
    blocks = io.read_all_blocks()
    assert len(blocks) == 1
    block_new = blocks[0]

    for seg_old, seg_new in zip(block.segments, block_new.segments):
        for anasig_old, anasig_new in zip(seg_old.analogsignals, seg_new.analogsignals):
            # ignoring differences in the file_origin attribute
            anasig_old.file_origin = anasig_new.file_origin

            assert_same_sub_schema(anasig_old, anasig_new)
            assert_same_annotations(anasig_old, anasig_new)
            assert_same_array_annotations(anasig_old, anasig_new)
            del anasig_old
        print(f'AnalogSignals are equivalent.')
        
        for st_old, st_new in zip(seg_old.spiketrains, seg_new.spiketrains):
            # ignoring differences in the file_origin attribute
            st_old.file_origin = st_new.file_origin

            assert_same_sub_schema(st_old, st_new)
            assert_same_annotations(st_old, st_new)
            assert_same_array_annotations(st_old, st_new)
            del st_old
        print(f'Spiketrains are equivalent.')
        
        for ev_old, ev_new in zip(seg_old.events, seg_new.events):
            # ignoring differences in the file_origin attribute
            ev_old.file_origin = ev_new.file_origin

            # ignore list-array type changes
            if 'color_codes' in ev_old.annotations:
                ev_old.annotations['color_codes'] = list(ev_old.annotations['color_codes'])

            assert_same_sub_schema(ev_old, ev_new)
            assert_same_annotations(ev_old, ev_new)
            assert_same_array_annotations(ev_old, ev_new)
            del ev_old
        print(f'Events are equivalent.')
        
        for ep_old, ep_new in zip(seg_old.epochs, seg_new.epochs):
            # ignoring differences in the file_origin attribute
            ep_old.file_origin = ep_new.file_origin

            assert_same_sub_schema(ep_old, ep_new)
            assert_same_annotations(ep_old, ep_new)
            assert_same_array_annotations(ep_old, ep_new)
            del ep_old
        print(f'Epochs are equivalent.')