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__init__.py
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__init__.py
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# -*- coding: utf-8 -*-
# Copyright 2017-2018 The pyXem developers
#
# This file is part of pyXem.
#
# pyXem is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# pyXem is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with pyXem. If not, see <http://www.gnu.org/licenses/>.
import glob
import logging
import os
import warnings
import numpy as np
from hyperspy.drawing.marker import markers_metadata_dict_to_markers
from hyperspy.exceptions import VisibleDeprecationWarning
from hyperspy.io import load_with_reader
from hyperspy.misc.io.tools import ensure_directory
from hyperspy.misc.io.tools import overwrite as overwrite_method
from hyperspy.misc.utils import stack as stack_method
from hyperspy.misc.utils import (strlist2enumeration, find_subclasses)
from hyperspy.ui_registry import get_gui
from hyperspy.api import roi
from natsort import natsorted
from .components.diffraction_component import ElectronDiffractionForwardModel
from .generators.diffraction_generator import DiffractionGenerator
from .generators.library_generator import DiffractionLibraryGenerator
from .signals.crystallographic_map import CrystallographicMap
from .signals.diffraction_profile import ElectronDiffractionProfile
from .signals.electron_diffraction import ElectronDiffraction
from .signals.diffraction_simulation import DiffractionSimulation
from .signals.diffraction_vectors import DiffractionVectors
from .signals.vdf_image import VDFImage
from .io_plugins import io_plugins, default_write_ext
from .io_plugins import mib as mib_reader
_logger = logging.getLogger(__name__)
# Utility string:
f_error_fmt = (
"\tFile %d:\n"
"\t\t%d signals\n"
"\t\tPath: %s")
def load(filenames=None,
signal_type=None,
stack=False,
stack_axis=None,
new_axis_name="stack_element",
lazy=False,
**kwds):
"""
Load supported files into a pyxem structure.
Supported formats: hspy (HDF5), Medipix (hdr + mib), blockfile, Gatan dm3,
tif, msa, Bruker bcf, FEI ser and emi, SEMPER unf, EMD, EDAX spd/spc, tif,
and a number of image formats.
Additional keyword arguments are passed to the corresponding reader. For
available options see their individual documentation, which may be found in
either pyxem or hyperspy.
Parameters
----------
filenames : None, str or list of strings
The filename to be loaded. If None, a window will open to select
a file to load. If a valid filename is passed in that single
file is loaded. If multiple file names are passed in
a list, a list of objects or a single object containing the data
of the individual files stacked are returned. This behaviour is
controlled by the `stack` parameter (see bellow). Multiple
files can be loaded by using simple shell-style wildcards,
e.g. 'my_file*.msa' loads all the files that starts
by 'my_file' and has the '.msa' extension.
signal_type : {None, "electron_diffraction", "diffraction_profile",
"diffraction_vectors", "crystallographic_map", str}
The acronym that identifies the signal type.
The value provided may determine the Signal subclass assigned to the
data.
If None the value is read/guessed from the file. Any other value
overrides the value stored in the file if any.
For electron energy-loss spectroscopy use "EELS".
For energy dispersive x-rays use "EDS_TEM"
if acquired from an electron-transparent sample — as it is usually
the case in a transmission electron microscope (TEM) —,
"EDS_SEM" if acquired from a non electron-transparent sample
— as it is usually the case in a scanning electron microscope (SEM) —.
If "" (empty string) the value is not read from the file and is
considered undefined.
stack : bool
If True and multiple filenames are passed in, stacking all
the data into a single object is attempted. All files must match
in shape. If each file contains multiple (N) signals, N stacks will be
created, with the requirement that each file contains the same number
of signals.
stack_axis : {None, int, str}
If None, the signals are stacked over a new axis. The data must
have the same dimensions. Otherwise the
signals are stacked over the axis given by its integer index or
its name. The data must have the same shape, except in the dimension
corresponding to `axis`.
new_axis_name : string
The name of the new axis when `axis` is None.
If an axis with this name already
exists it automatically append '-i', where `i` are integers,
until it finds a name that is not yet in use.
lazy : {None, bool}
Open the data lazily - i.e. without actually reading the data from the
disk until required. Allows opening arbitrary-sized datasets. default
is `False`.
print_info: bool
For SEMPER unf- and EMD (Berkley)-files, if True (default is False)
additional information read during loading is printed for a quick
overview.
downsample : int (1–4095)
For Bruker bcf files, if set to integer (>=2) (default 1)
bcf is parsed into down-sampled size array by given integer factor,
multiple values from original bcf pixels are summed forming downsampled
pixel. This allows to improve signal and conserve the memory with the
cost of lower resolution.
cutoff_at_kV : {None, int, float}
For Bruker bcf files, if set to numerical (default is None)
bcf is parsed into array with depth cutoff at coresponding given energy.
This allows to conserve the memory, with cutting-off unused spectra's
tail, or force enlargement of the spectra size.
select_type: {'spectrum', 'image', None}
For Bruker bcf files, if one of 'spectrum' or 'image' (default is None)
the loader returns either only hypermap or only SEM/TEM electron images.
Returns
-------
Signal instance or list of signal instances
Examples
--------
Loading a single file providing the signal type:
>>> d = hs.load('file.dm3', signal_type="EDS_TEM")
Loading multiple files:
>>> d = hs.load('file1.dm3','file2.dm3')
Loading multiple files matching the pattern:
>>> d = hs.load('file*.dm3')
Loading (potentially larger than the available memory) files lazily and
stacking:
>>> s = hs.load('file*.blo', lazy=True, stack=True)
"""
deprecated = ['mmap_dir', 'load_to_memory']
warn_str = "'{}' argument is deprecated, please use 'lazy' instead"
for k in deprecated:
if k in kwds:
lazy = True
warnings.warn(warn_str.format(k), VisibleDeprecationWarning)
del kwds[k]
kwds['signal_type'] = signal_type
if filenames is None:
from hyperspy.signal_tools import Load
load_ui = Load()
get_gui(load_ui, toolkey="load")
if load_ui.filename:
filenames = load_ui.filename
lazy = load_ui.lazy
if filenames is None:
raise ValueError("No file provided to reader")
if isinstance(filenames, str):
filenames = natsorted([f for f in glob.glob(filenames)
if os.path.isfile(f)])
if not filenames:
raise ValueError('No file name matches this pattern')
elif not isinstance(filenames, (list, tuple)):
raise ValueError(
'The filenames parameter must be a list, tuple, string or None')
if not filenames:
raise ValueError('No file provided to reader.')
else:
if len(filenames) > 1:
_logger.info('Loading individual files')
if stack is True:
# We are loading a stack!
# Note that while each file might contain several signals, all
# files are required to contain the same number of signals. We
# therefore use the first file to determine the number of signals.
for i, filename in enumerate(filenames):
obj = load_single_file(filename, lazy=lazy,
**kwds)
if i == 0:
# First iteration, determine number of signals, if several:
if isinstance(obj, (list, tuple)):
n = len(obj)
else:
n = 1
# Initialize signal 2D list:
signals = [[] for j in range(n)]
else:
# Check that number of signals per file doesn't change
# for other files:
if isinstance(obj, (list, tuple)):
if n != len(obj):
raise ValueError(
"The number of sub-signals per file does not "
"match:\n" +
(f_error_fmt % (1, n, filenames[0])) +
(f_error_fmt % (i, len(obj), filename)))
elif n != 1:
raise ValueError(
"The number of sub-signals per file does not "
"match:\n" +
(f_error_fmt % (1, n, filenames[0])) +
(f_error_fmt % (i, len(obj), filename)))
# Append loaded signals to 2D list:
if n == 1:
signals[0].append(obj)
elif n > 1:
for j in range(n):
signals[j].append(obj[j])
# Next, merge the signals in the `stack_axis` direction:
# When each file had N signals, we create N stacks!
objects = []
for i in range(n):
signal = signals[i] # Sublist, with len = len(filenames)
signal = stack_method(
signal, axis=stack_axis, new_axis_name=new_axis_name,
lazy=lazy)
signal.metadata.General.title = os.path.split(
os.path.split(os.path.abspath(filenames[0]))[0])[1]
_logger.info('Individual files loaded correctly')
_logger.info(signal._summary())
objects.append(signal)
else:
# No stack, so simply we load all signals in all files separately
objects = [load_single_file(filename, lazy=lazy,
**kwds)
for filename in filenames]
if len(objects) == 1:
objects = objects[0]
return objects
def load_single_file(filename,
signal_type=None,
**kwds):
"""
Load any supported file into an HyperSpy structure
Supported formats: netCDF, msa, Gatan dm3, Ripple (rpl+raw),
Bruker bcf, FEI ser and emi, EDAX spc and spd, hspy (HDF5), and SEMPER unf.
Parameters
----------
filename : string
File name (including the extension)
"""
extension = os.path.splitext(filename)[1][1:]
i = 0
while extension.lower() not in io_plugins[i].file_extensions and \
i < len(io_plugins) - 1:
i += 1
if i == len(io_plugins):
# Try to load it with the python imaging library
try:
from hyperspy.io_plugins import image
reader = image
return load_with_reader(filename, reader,
signal_type=signal_type, **kwds)
except BaseException:
raise IOError('If the file format is supported'
' please report this error')
else:
reader = io_plugins[i]
return load_with_reader(filename=filename,
reader=reader,
signal_type=signal_type,
**kwds)
def load_with_reader(filename,
reader,
signal_type=None,
**kwds):
lazy = kwds.get('lazy', False)
file_data_list = reader.file_reader(filename,
**kwds)
objects = []
for signal_dict in file_data_list:
if 'metadata' in signal_dict:
if "Signal" not in signal_dict["metadata"]:
signal_dict["metadata"]["Signal"] = {}
if signal_type is not None:
signal_dict['metadata']["Signal"]['signal_type'] = signal_type
objects.append(dict2signal(signal_dict, lazy=lazy))
folder, filename = os.path.split(os.path.abspath(filename))
filename, extension = os.path.splitext(filename)
objects[-1].tmp_parameters.folder = folder
objects[-1].tmp_parameters.filename = filename
objects[-1].tmp_parameters.extension = extension.replace('.', '')
else:
# it's a standalone model
continue
if len(objects) == 1:
objects = objects[0]
return objects
def assign_signal_subclass(dtype,
signal_dimension,
signal_type="",
lazy=False):
"""Given record_by and signal_type return the matching Signal subclass.
Parameters
----------
dtype : :class:`~.numpy.dtype`
signal_dimension: int
signal_type : {None, "electron_diffraction", "diffraction_profile",
"diffraction_vectors", "crystallographic_map", str}
lazy: bool
Returns
-------
Signal or subclass
"""
# TODO: This method needs to be re-written for pyXem signals!
import hyperspy._lazy_signals
from hyperspy.signal import BaseSignal
# Check if parameter values are allowed:
if np.issubdtype(dtype, np.complexfloating):
dtype = 'complex'
elif ('float' in dtype.name or 'int' in dtype.name or
'void' in dtype.name or 'bool' in dtype.name or
'object' in dtype.name):
dtype = 'real'
else:
raise ValueError('Data type "{}" not understood!'.format(dtype.name))
if not isinstance(signal_dimension, int) or signal_dimension < 0:
raise ValueError("signal_dimension must be a positive interger")
base_signals = find_subclasses(hyperspy.signals, BaseSignal)
lazy_signals = find_subclasses(hyperspy._lazy_signals,
hyperspy._lazy_signals.LazySignal)
if lazy:
signals = lazy_signals
else:
signals = {
k: v for k,
v in base_signals.items() if k not in lazy_signals}
dtype_matches = [s for s in signals.values() if dtype == s._dtype]
dtype_dim_matches = [s for s in dtype_matches
if signal_dimension == s._signal_dimension]
dtype_dim_type_matches = [s for s in dtype_dim_matches if signal_type == s._signal_type
or signal_type in s._alias_signal_types]
if dtype_dim_type_matches:
# Perfect match found, return it.
return dtype_dim_type_matches[0]
elif [s for s in dtype_dim_matches if s._signal_type == ""]:
# just signal_dimension and dtype matches
# Return a general class for the given signal dimension.
return [s for s in dtype_dim_matches if s._signal_type == ""][0]
else:
# no signal_dimension match either, hence return the general subclass for
# correct dtype
return [s for s in dtype_matches if s._signal_dimension == -
1 and s._signal_type == ""][0]
def dict2signal(signal_dict, lazy=False):
"""Create a signal (or subclass) instance defined by a dictionary
Parameters
----------
signal_dict : dictionary
Returns
-------
s : Signal or subclass
"""
signal_dimension = -1 # undefined
signal_type = ""
if "metadata" in signal_dict:
mp = signal_dict["metadata"]
if "Signal" in mp and "record_by" in mp["Signal"]:
record_by = mp["Signal"]['record_by']
if record_by == "spectrum":
signal_dimension = 1
elif record_by == "image":
signal_dimension = 2
del mp["Signal"]['record_by']
if "Signal" in mp and "signal_type" in mp["Signal"]:
signal_type = mp["Signal"]['signal_type']
if "attributes" in signal_dict and "_lazy" in signal_dict["attributes"]:
lazy = signal_dict["attributes"]["_lazy"]
# "Estimate" signal_dimension from axes. It takes precedence over record_by
if ("axes" in signal_dict and
len(signal_dict["axes"]) == len(
[axis for axis in signal_dict["axes"] if "navigate" in axis])):
# If navigate is defined for all axes
signal_dimension = len(
[axis for axis in signal_dict["axes"] if not axis["navigate"]])
elif signal_dimension == -1:
# If not defined, all dimension are categorised as signal
signal_dimension = signal_dict["data"].ndim
signal = assign_signal_subclass(signal_dimension=signal_dimension,
signal_type=signal_type,
dtype=signal_dict['data'].dtype,
lazy=lazy)(**signal_dict)
if signal._lazy:
signal._make_lazy()
if signal.axes_manager.signal_dimension != signal_dimension:
# This may happen when the signal dimension couldn't be matched with
# any specialised subclass
signal.axes_manager.set_signal_dimension(signal_dimension)
if "post_process" in signal_dict:
for f in signal_dict['post_process']:
signal = f(signal)
if "mapping" in signal_dict:
for opattr, (mpattr, function) in signal_dict["mapping"].items():
if opattr in signal.original_metadata:
value = signal.original_metadata.get_item(opattr)
if function is not None:
value = function(value)
if value is not None:
signal.metadata.set_item(mpattr, value)
if "metadata" in signal_dict and "Markers" in mp:
markers_dict = markers_metadata_dict_to_markers(
mp['Markers'],
axes_manager=signal.axes_manager)
del signal.metadata.Markers
signal.metadata.Markers = markers_dict
return signal
def save(filename, signal, overwrite=None, **kwds):
extension = os.path.splitext(filename)[1][1:]
if extension == '':
extension = "hspy"
filename = filename + '.' + extension
writer = None
for plugin in io_plugins:
if extension.lower() in plugin.file_extensions:
writer = plugin
break
if writer is None:
raise ValueError(
('.%s does not correspond to any supported format. Supported ' +
'file extensions are: %s') %
(extension, strlist2enumeration(default_write_ext)))
else:
# Check if the writer can write
sd = signal.axes_manager.signal_dimension
nd = signal.axes_manager.navigation_dimension
if writer.writes is False:
raise ValueError('Writing to this format is not '
'supported, supported file extensions are: %s ' %
strlist2enumeration(default_write_ext))
if writer.writes is not True and (sd, nd) not in writer.writes:
yes_we_can = [plugin.format_name for plugin in io_plugins
if plugin.writes is True or
plugin.writes is not False and
(sd, nd) in plugin.writes]
raise IOError('This file format cannot write this data. '
'The following formats can: %s' %
strlist2enumeration(yes_we_can))
ensure_directory(filename)
if overwrite is None:
overwrite = overwrite_method(filename)
if overwrite is True:
writer.file_writer(filename, signal, **kwds)
_logger.info('The %s file was created' % filename)
folder, filename = os.path.split(os.path.abspath(filename))
signal.tmp_parameters.set_item('folder', folder)
signal.tmp_parameters.set_item('filename',
os.path.splitext(filename)[0])
signal.tmp_parameters.set_item('extension', extension)
def load_mib(filename, scan_size):
"""
Load medipix file.
Paramters:
filename : string
File path and name
scan_size : int
Scan size in pixels, allows the function to reshape the array into
the right shape.
"""
dpt = load_with_reader(filename=filename, reader=mib_reader)
dpt = ElectronDiffraction(dpt.data.reshape((scan_size, scan_size, 256, 256)))
trace = dpt.inav[:,0:5].sum((1,2,3))
edge = np.where(trace==max(trace.data))[0][0]
if edge==scan_size - 1:
dp = ElectronDiffraction(dpt.inav[0:edge, 1:])
else:
dp = ElectronDiffraction(np.concatenate((dpt.inav[edge + 1:, 1:], dpt.inav[0:edge, 1:]), axis=1))
return dp