def test_apply_along_axis(func1d_name, func1d, shape, axis):
a = np.random.randint(0, 10, shape)
d = da.from_array(a, chunks=(len(shape) * (5, )))
if (func1d_name == "range2"
and LooseVersion(np.__version__) < LooseVersion("1.13.0")):
with pytest.raises(ValueError):
da.apply_along_axis(func1d, axis, d)
else:
assert_eq(da.apply_along_axis(func1d, axis, d),
np.apply_along_axis(func1d, axis, a))
def test_apply_along_axis(func1d_name, func1d, shape, axis):
a = np.random.randint(0, 10, shape)
d = da.from_array(a, chunks=(len(shape) * (5,)))
if (func1d_name == "range2" and
LooseVersion(np.__version__) < LooseVersion("1.13.0")):
with pytest.raises(ValueError):
da.apply_along_axis(func1d, axis, d)
else:
assert_eq(
da.apply_along_axis(func1d, axis, d),
np.apply_along_axis(func1d, axis, a)
)
def local_times(coords, time_index, hour_range=(7, 17)):
"""Return a 2d array of local date times for a set of points between
8 AM and 5 PM.
"""
# Day One
t1 = time_index[0][:16].decode("utf-8")
d1 = dt.datetime.strptime(t1, "%Y-%m-%dT%H:%M")
coords["day1"] = coords["zone"].apply(lambda x: d1 + dt.timedelta(hours=x))
# An array with every day in the hour range would be useful...
# An array of first days
# first_days = [pd.Timestamp(d).to_pydatetime() for d in coords["day1"]]
first_days = coords["day1"].values
# Every half increment in a day for one start date
rt = range(len(time_index))
periods = [30 * i for i in rt]
def single(d):
return np.array([d + np.timedelta64(periods[i], "m") for i in rt])
# Longest way
ndarray = []
for i in tqdm(range(len(first_days))):
array = single(first_days[i])
ndarray.append(array)
# With dask?
ddays = da.from_array(first_days, chunks="auto")
fddays = da.apply_along_axis(single, 0, ddays, dtype="<M8[ns]")
def least_squares(lhs, rhs, rcond=None, skipna=False):
import dask.array as da
lhs_da = da.from_array(lhs, chunks=(rhs.chunks[0], lhs.shape[1]))
if skipna:
added_dim = rhs.ndim == 1
if added_dim:
rhs = rhs.reshape(rhs.shape[0], 1)
results = da.apply_along_axis(
nputils._nanpolyfit_1d,
0,
rhs,
lhs_da,
dtype=float,
shape=(lhs.shape[1] + 1, ),
rcond=rcond,
)
coeffs = results[:-1, ...]
residuals = results[-1, ...]
if added_dim:
coeffs = coeffs.reshape(coeffs.shape[0])
residuals = residuals.reshape(residuals.shape[0])
else:
coeffs, residuals, _, _ = da.linalg.lstsq(lhs_da, rhs)
return coeffs, residuals
def test_apply_along_axis(func1d_name, func1d, shape, axis):
a = np.random.randint(0, 10, shape)
d = da.from_array(a, chunks=(len(shape) * (5,)))
assert_eq(
da.apply_along_axis(func1d, axis, d),
np.apply_along_axis(func1d, axis, a)
)
def detrend(cube, dimension='time', method='linear'):
"""
Detrend data along a given dimension.
Parameters
----------
cube: iris.cube.Cube
input cube.
dimension: str
Dimension to detrend
method: str
Method to detrend. Available: linear, constant. See documentation of
'scipy.signal.detrend' for details
Returns
-------
iris.cube.Cube
Detrended cube
"""
coord = cube.coord(dimension)
axis = cube.coord_dims(coord)[0]
detrended = da.apply_along_axis(
scipy.signal.detrend,
axis=axis,
arr=cube.lazy_data(),
type=method,
shape=(cube.shape[axis],)
)
return cube.copy(detrended)
def test_apply_along_axis(func1d_name, func1d, shape, axis):
a = np.random.randint(0, 10, shape)
d = da.from_array(a, chunks=(len(shape) * (5,)))
assert_eq(
da.apply_along_axis(func1d, axis, d),
np.apply_along_axis(func1d, axis, a)
)
def calibrate_posterior_predictive(post_pred, qc):
""" Function to calibrate posterior predictive.
This allows the calibrated model to make predictions. This function is required to compute
mean and log likelihood of the calibrated model.
Args:
post_pred: posterior predictive of shape (num samples, num X values)
qc: calibration object as defined in class QuantileCalibration
Returns:
calibrated posterior predictive of shape (num samples, num X values)
"""
# Need to convert from jax array to dask array to avoid
# out of memory error (on a 32GB machine for 8000 samples) in the next step.
# This also helps to parallelize the task to all cpu cores.
post_pred_shape = post_pred.shape
res_main_post_pred = da.from_array(
np.array(post_pred),
chunks=(
1000, # reduce this value if out of memory!
np.ceil(post_pred_shape[1] / dask.system.cpu_count()),
),
)
# expand to 3D: axis 0: num observations; axis 1: num samples; axis 2: num samples
uncalibrated_pp_quantiles = (
da.sum(res_main_post_pred.T[:, :, np.newaxis] <=
res_main_post_pred.T[:, np.newaxis, :],
axis=1).T / post_pred_shape[0])
# calculate inverse R
inverse_calibrated_pp_quantiles = da.apply_along_axis(
qc.inverse_transform, 0, uncalibrated_pp_quantiles)
# inverse CDF by looking up existing samples with np.quantile()
da_combined = da.vstack(
[res_main_post_pred,
inverse_calibrated_pp_quantiles.compute()])
calibrated_post_pred = da.apply_along_axis(
lambda q: np.quantile(
q[:post_pred_shape[0]], q[post_pred_shape[0]:], axis=0),
0,
da_combined,
).compute()
return calibrated_post_pred
def apply_distance_using_dask(t1,f1):
# Compute the grid for any configuration.
import numpy as np
import dask.array as da
# gps = da.stack(da.meshgrid(da.linspace(-0.5,0.5, t1.nx_total), da.linspace(-0.5,0.5, t1.ny_total),da.linspace(-0.5,0.5, t1.nz_total)), -1).reshape(-1, 3)
gps = da.stack(da.meshgrid(t1.x_grid, t1.y_grid,t1.z_grid, indexing='ij'), -1).reshape(-1, 3) # * Only the unit cell.
gps =gps.rechunk(10000,3)
grid = da.apply_along_axis(func1d=grid_point_distance, frameda=da.from_array(t1.coord), Ada=da.from_array(t1.A),sig = da.from_array(f1.sigma), sigda=da.from_array(f1.sigma_array), epsda=da.from_array(f1.epsilon_array), axis=1, arr=gps)
return grid
def detrend(cube, dimension='time', method='linear'):
coord = cube.coord(dimension)
axis = cube.coord_dims(coord)[0]
detrended = da.apply_along_axis(scipy.signal.detrend,
axis=axis,
arr=cube.lazy_data(),
type=method,
shape=(cube.shape[axis], ))
return cube.copy(detrended)
def _qg_dask_array(x, axis, inplace):
import dask.array as da
from scipy.stats import norm
from numpy_sugar import nanrankdata
if inplace:
raise NotImplementedError()
x = x.swapaxes(1, axis)
x = dask.array_shape_reveal(x)
shape = da.compute(*x.shape)
x = da.ma.masked_array(x)
x *= -1
x = da.apply_along_axis(_dask_apply, 0, x, nanrankdata, shape[0])
x = x / (da.isfinite(x).sum(axis=0) + 1)
x = da.apply_along_axis(_dask_apply, 0, x, norm.isf, shape[0])
return x.swapaxes(1, axis)
def lazy_func(data, axis, x_data):
"""Calculate trend standard error lazily."""
trend_std_arr = da.apply_along_axis(_get_slope_stderr,
axis,
data,
x_data,
dtype=data.dtype,
shape=())
trend_std_arr = da.ma.masked_invalid(trend_std_arr)
return trend_std_arr
def code_range(path_dict):
"""
path_dict = RANGE_CATEGORIES[5]
"""
# Create a numeric dictionary for these keys
key_dict = {key: i + 1 for i, key in enumerate(path_dict.keys())}
number_dict = {k: i for i, k in key_dict.items()}
vals = key_dict.values()
combos = [[c for c in combinations(vals, i + 1)] for i in range(len(vals))]
combos = [c for sc in combos for c in sc]
combo_keys = {}
for combo in combos:
key = "-".join([number_dict[c] for c in combo])
value = seq_int(combo)
combo_keys[key] = value
# Assign each raster a unique value
arrays = []
for key, path in path_dict.items():
value = key_dict[key]
full_path = DP.join(path)
array = xr.open_rasterio(full_path, chunks=CHUNKS)[0].data
array[da.isnan(array)] = 0
array[array > 0] = value
arrays.append(array)
# Stack everything together - we might have to save this a temporary file
stack = da.stack(arrays, axis=0)
stack = stack.rechunk((stack.shape[0], 5000, 5000))
stack = stack[:, 4000:10000, 4000:10000]
# Try to map the function to each point
client = Client()
codes = da.apply_along_axis(seq_int, 0, stack, dtype="uint8")
future = client.compute(codes)
result = future.result()
client.shutdown()
client.close()
# Save to temp and delete
template = rasterio.open(full_path)
temp_path = DP2.join("test.tif")
with rasterio.Env():
profile = template.profile
profile.update(dtype=rasterio.uint8, count=1, compress='lzw')
with rasterio.open(temp_path, 'w', **profile) as dst:
dst.write(result)
def xarray_MK_trend(self):
"""
Computes linear trend over 'dim' of xr.dataarray.
Slope and intercept of the least square fit are added to a
array which contains the slope, significance mask and p-test.
"""
da = self.DataArray.copy().transpose(*self.ordered_dims)
axis_num = da.get_axis_num(self.dim)
data = dsa.apply_along_axis(self._calc_slope_MK,
axis_num,
da.data,
dtype=np.float64,
shape=(4, ))
return data
def test_apply_along_axis(func1d_name, func1d, specify_output_props, input_shape, axis):
a = np.random.randint(0, 10, input_shape)
d = da.from_array(a, chunks=(len(input_shape) * (5,)))
output_shape = None
output_dtype = None
if specify_output_props:
slices = [0] * a.ndim
slices[axis] = slice(None)
slices = tuple(slices)
sample = np.array(func1d(a[slices]))
output_shape = sample.shape
output_dtype = sample.dtype
assert_eq(
da.apply_along_axis(func1d, axis, d, dtype=output_dtype, shape=output_shape),
np.apply_along_axis(func1d, axis, a),
)
def to_xarray(zarr_data: xr.Dataset, channel_index: int,
bottom_depth: xr.DataArray, attributes: dict) -> xr.Dataset:
heave_corrected_transducer_depth = zarr_data['heave'] + zarr_data[
'transducer_draft'][channel_index]
bottom_range = bottom_depth - heave_corrected_transducer_depth
# Get indices of the bottom_range
bottom_range_idx = da.searchsorted(da.from_array(zarr_data.range),
bottom_range.data)
# Append indices to the last range
bottom_range_1 = zarr_data.sv.isel(frequency=0).data
bottom_range_1[:, -1] = bottom_range_idx
# Convert annotation to 2d array
bottom_range_2 = da.apply_along_axis(_bottom_2d,
1,
bottom_range_1,
dtype='float32',
shape=(bottom_range_1.shape[1], ))
# Create dataset
ds = xr.Dataset(
data_vars=dict(bottom_range=(['ping_time',
'range'], bottom_range_2), ),
coords=dict(
frequency=zarr_data['frequency'][0],
range=zarr_data['range'],
ping_time=zarr_data['ping_time'],
),
)
# Remove unused dims
remove_list = list(
filter(lambda s: s not in ['frequency', 'ping_time', 'range'],
list(ds.coords)))
ds = ds.drop_vars(remove_list)
for key in attributes.keys():
ds.attrs[key] = attributes[key]
return ds
def _mean_standardize_dask_array(x, axis, inplace):
import dask.array as da
from numpy_sugar import epsilon
from numpy import nanmean, clip, nanstd, inf
if inplace:
raise NotImplementedError()
x = x.swapaxes(1, axis)
x = dask.array_shape_reveal(x)
shape = da.compute(*x.shape)
def func(a):
a -= nanmean(a, axis=0)
a /= clip(nanstd(a, axis=0), epsilon.tiny, inf)
return a
with warnings.catch_warnings():
warnings.filterwarnings("ignore", category=RuntimeWarning)
x = da.apply_along_axis(_dask_apply, 0, x, func, shape[0])
return x.swapaxes(1, axis)
pass
logger.info('Initiating temporary file - ' + tmp_f)
f = h5py.File(tmp_f)
betavec = f.create_dataset('betavec',data=np.zeros([bim.shape[0],1]),chunks=(bim.shape[0]/nchunk, 1))
zvec = f.create_dataset('zvec',data=np.zeros([bim.shape[0],1]),chunks=(bim.shape[0]/nchunk, 1))
meanvec = f.create_dataset('meanvec',data=np.zeros([bim.shape[0],1]),chunks=(bim.shape[0]/nchunk, 1))
hetvec = f.create_dataset('hetvec',data=np.zeros([bim.shape[0],1]),chunks=(bim.shape[0]/nchunk, 1))
#####################################Calculation by Chunk ##############
#
# Begin chunk processing
for chunk1 in chunk_array:
print('Processing Chunk - ' + str(chunk_ind) + ' of ' + str(nchunk))
# Compute
geno_chunk = geno_ia[chunk1,:]
g = da.apply_along_axis(SimpleImpute, 1, geno_chunk)
with ProgressBar():
results = da.compute(g, get=get)
gtmp = np.stack(results[0][:,0])
if args.apr_flag == 'N':
vtmp = da.diag(da.matmul(gtmp, da.matmul(gtmp, C).transpose())).compute()
else:
vtmp = np.diagonal(np.matmul(gtmp, gtmp.transpose())) # assuming difference is identity
beta_tmp = np.matmul(gtmp, res_surv)
betavec[chunk1, 0] = beta_tmp
zvec[chunk1, 0] = beta_tmp/np.sqrt(vtmp)
meanvec[chunk1, 0] = np.stack(results[0][:,1])
hetvec[chunk1, 0] = np.stack(results[0][:,2])
chunk_ind += 1
##########################################################################
"""
Function:
Author: Du Fei
Create Time: 2020/5/31 11:08
"""
import numpy as np
import dask.array as da
from dask.dataframe.utils import make_meta
if __name__ == '__main__':
source_array = np.random.randint(0, 10, (2, 4))
index_array = np.asarray([[0, 0], [1, 0], [2, 1], [3, 2]])
b = np.apply_along_axis(lambda a: a[index_array], 1, source_array)
print(b)
source_array = da.from_array(source_array)
# b = da.apply_along_axis(lambda a: a[index_array], 1, source_array)
res = da.apply_along_axis(lambda a: a[index_array],
1,
source_array,
shape=make_meta(source_array).shape,
dtype=make_meta(source_array).dtype).compute()
print(res)
print(res)
# start = time.time()
# res = d_da.map_blocks(
# lambda df: ruzicka_mat(cp.array(df), vector_new), dtype=cp.float32
# ).compute()
# print("dask_da_cupy:", time.time() - start)
# print(res)
if cupy_raw:
# 3 CUPY
start = time.time()
y = cp.zeros(len(d_da), dtype=cp.float32)
ruzicka_kernel(
((len(d_da) + 31) // 32, (len(d_da) + 31) // 32),
(32, 32),
(cp.array(d_da), vector_new, y, 1024, len(d_da)),
)
print("cupy_raw:", time.time() - start)
# print(y, len(y))
if dask_apply:
# 4 DASK ARRAY WITH apply_along_axis
start = time.time()
res = da.apply_along_axis(lambda df: ruzicka_vec(df, vector_new), 1,
d_da).compute()
print("dask_apply:", time.time() - start)
# print(res, y)
client.close()