def run_test(args):
T = Terminal
x = T('x')
y = T('y')
z = T('z')
w = T('w')
a = T('a')
b = T('b')
vm = "python" if "python" in args else "numexpr"
print "evaluating expression with '%s' vm..." % vm
expr = (x+y).dot(a*z + b*w)
print 'opening blaze arrays...'
x_ = blaze.open(_persistent_array_names[0])
y_ = blaze.open(_persistent_array_names[1])
z_ = blaze.open(_persistent_array_names[2])
w_ = blaze.open(_persistent_array_names[3])
a_ = 2.0
b_ = 2.0
if 'in_memory' in args:
print 'getting an in-memory version of blaze arrays...'
params = blaze.params(clevel=0)
t0 = time()
x_ = blaze.array(x_[:], params=params)
y_ = blaze.array(y_[:], params=params)
z_ = blaze.array(z_[:], params=params)
w_ = blaze.array(w_[:], params=params)
print "conversion to blaze in-memory: %.3f" % (time() - t0)
print 'datashape is:', x_.datashape
if 'print_expr' in args:
print expr
t_ce = time()
expr_vars = {'x': x_, 'y': y_, 'z': z_, 'w': w_, 'a': a_, 'b': b_, }
result_ce = expr.eval(expr_vars, params={'vm': vm})
t_ce = time() - t_ce
print "'%s' vm result is : %s in %.3f s" % (vm, result_ce, t_ce)
# in numpy...
print 'evaluating expression with numpy...'
x_ = x_[:]
y_ = y_[:]
z_ = z_[:]
w_ = w_[:]
t_np = time()
result_np = np.dot(x_+y_, a_*z_ + b_*w_)
t_np = time() - t_np
print 'numpy result is : %s in %.3f s' % (result_np, t_np)
def run_test(in_memory, args):
T = Terminal
print 'opening blaze arrays...'
x = blaze.open(_persistent_array_names[0])
y = blaze.open(_persistent_array_names[1])
z = blaze.open(_persistent_array_names[2])
w = blaze.open(_persistent_array_names[3])
shape, dtype = blaze.to_numpy(x.datashape)
print "***nelements:", shape[0]
if in_memory:
print 'getting an in-memory version of blaze arrays...'
params = blaze.params(clevel=9)
t0 = time()
x = blaze.array(x[:], params=params)
y = blaze.array(y[:], params=params)
z = blaze.array(z[:], params=params)
w = blaze.array(w[:], params=params)
print "conversion to blaze in-memory: %.3f" % (time() - t0)
print 'datashape is:', x.datashape
print 'evaluating expression with blir...'
expr = (T(x) + T(y)).dot(T(2.0) * T(z) + T(2.0) * T(w))
if 'print_expr' in args:
print expr.gen_blir()[1]
t_ce = time()
result_ce = chunked_eval(expr, chunk_size=50000)
t_ce = time() - t_ce
print 'blir chunked result is : %s in %f s' % (result_ce, t_ce)
print '***blir time: %.3f' % t_ce
# in numpy...
t0 = time()
x = x[:]
y = y[:]
z = z[:]
w = w[:]
print "conversion to numpy in-memory: %.3f" % (time() - t0)
print 'evaluating expression with numpy...'
t_np = time()
result_np = np.dot(x + y, 2.0 * z + 2.0 * w)
t_np = time() - t_np
print 'numpy result is : %s in %f s' % (result_np, t_np)
print '***numpy time: %.3f' % t_np
print '**** %d, %.5f, %.5f' % (shape[0], t_ce, t_np)
def run_test(in_memory, args):
T = Terminal
print "opening blaze arrays..."
x = blaze.open(_persistent_array_names[0])
y = blaze.open(_persistent_array_names[1])
z = blaze.open(_persistent_array_names[2])
w = blaze.open(_persistent_array_names[3])
shape, dtype = blaze.to_numpy(x.datashape)
print "***nelements:", shape[0]
if in_memory:
print "getting an in-memory version of blaze arrays..."
params = blaze.params(clevel=9)
t0 = time()
x = blaze.array(x[:], params=params)
y = blaze.array(y[:], params=params)
z = blaze.array(z[:], params=params)
w = blaze.array(w[:], params=params)
print "conversion to blaze in-memory: %.3f" % (time() - t0)
print "datashape is:", x.datashape
print "evaluating expression with blir..."
expr = (T(x) + T(y)).dot(T(2.0) * T(z) + T(2.0) * T(w))
if "print_expr" in args:
print expr.gen_blir()[1]
t_ce = time()
result_ce = chunked_eval(expr, chunk_size=50000)
t_ce = time() - t_ce
print "blir chunked result is : %s in %f s" % (result_ce, t_ce)
print "***blir time: %.3f" % t_ce
# in numpy...
t0 = time()
x = x[:]
y = y[:]
z = z[:]
w = w[:]
print "conversion to numpy in-memory: %.3f" % (time() - t0)
print "evaluating expression with numpy..."
t_np = time()
result_np = np.dot(x + y, 2.0 * z + 2.0 * w)
t_np = time() - t_np
print "numpy result is : %s in %f s" % (result_np, t_np)
print "***numpy time: %.3f" % t_np
print "**** %d, %.5f, %.5f" % (shape[0], t_ce, t_np)
def chunkwise_kernel():
ast, env = compile(source)
#Array = ca.carray(xrange(25000), rootdir='example1', mode='w',
#dtype='int32', cparams=ca.cparams(clevel=0))
Array = open('example1', mode='w')
c = Array.data.ca
ctx = Context(env)
for i in range(c.nchunks):
chunk = c.chunks[i]
# read only access
#x = c.chunks[0][:]
# write access
x = view(chunk)
size = x.strides[0]
args = (x, size)
execute(ctx, args, fname='main')
# this does a _save() behind the scenes
c.chunks[i] = chunk
ctx.destroy()
rts = Runtime(1,2,3)
rts.join()
print Array
def test_open(self):
persist = blaze.Persist(self.rooturi)
a = blaze.ones('0, float64', persist=persist)
a.append(range(10))
# Re-open the dataset in URI
a2 = blaze.open(persist)
self.assert_(isinstance(a2, blaze.Array))
self.assertEqual(dd_as_py(a2._data), list(range(10)))
def run_test(args):
T = Terminal
print 'opening blaze arrays...'
x = blaze.open(_persistent_array_names[0])
y = blaze.open(_persistent_array_names[1])
z = blaze.open(_persistent_array_names[2])
w = blaze.open(_persistent_array_names[3])
if 'in_memory' in args:
print 'getting an in-memory version of blaze arrays...'
params = blaze.params(clevel=9)
t0 = time()
x = blaze.array(x, params=params)
y = blaze.array(y, params=params)
z = blaze.array(z, params=params)
w = blaze.array(w, params=params)
print "conversion to blaze in-memory: %.3f" % (time() - t0)
print 'datashape is:', x.datashape
print 'evaluating expression with blir...'
expr = (T(x)+T(y)).dot(T(2.0)*T(z) + T(2.0)*T(w))
if 'print_expr' in args:
print expr.gen_blir()[1]
t_ce = time()
result_ce = chunked_eval(expr, chunk_size=50000)
t_ce = time() - t_ce
print 'blir chunked result is : %s in %f s' % (result_ce, t_ce)
# in numpy...
t0 = time()
x = x[:]
y = y[:]
z = z[:]
w = w[:]
print "Conversion to numpy in-memory: %.3f" % (time() - t0)
print 'evaluating expression with numpy...'
t_np = time()
result_np = np.dot(x+y, 2.0*z + 2.0*w)
t_np = time() - t_np
print 'numpy result is : %s in %f s' % (result_np, t_np)
def test_open(self):
persist = blaze.Storage(self.rooturi, format="blz")
a = blaze.ones('0 * float64', storage=persist)
append(a,range(10))
# Re-open the dataset in URI
a2 = blaze.open(persist)
self.assertTrue(isinstance(a2, blaze.Array))
self.assertEqual(dd_as_py(a2._data), list(range(10)))
def run_test(args):
T = Terminal
x = T('x')
y = T('y')
z = T('z')
w = T('w')
a = T('a')
b = T('b')
vm = "numexpr" if "numexpr" in args else "python"
print "evaluating expression with '%s' vm..." % vm
expr = (x+y).dot(a*z + b*w)
print 'opening blaze arrays...'
x_ = blaze.open(_persistent_array_names[0])
y_ = blaze.open(_persistent_array_names[0])
z_ = blaze.open(_persistent_array_names[0])
w_ = blaze.open(_persistent_array_names[0])
a_ = 2.0
b_ = 2.0
print 'datashape is ', x_.datashape
if 'print_expr' in args:
print expr
t_ce = time()
expr_vars = {'x': x_, 'y': y_, 'z': z_, 'w': w_, 'a': a_, 'b': b_, }
result_ce = expr.eval(expr_vars, params={'vm': vm})
t_ce = time() - t_ce
print "'%s' vm result is : %s in %.3f s" % (vm, result_ce, t_ce)
# in numpy...
print 'evaluating expression with numpy..'
x_ = x_[:]
y_ = y_[:]
z_ = z_[:]
w_ = w_[:]
t_np = time()
result_np = np.dot(x_+y_, a_*z_ + b_*w_)
t_np = time() - t_np
print 'numpy result is : %s in %.3f s' % (result_np, t_np)
def build_array(array_name, rows):
if not os.path.exists(array_name):
ds = 'x, float'
p = params(clevel=5, storage=array_name)
t = fromiter((0.1*i for i in xrange(rows)),
dshape=ds, params=p)
t.commit()
else:
t = open(array_name)
return t
def sliding_window_blz(dirname, window_size):
X = blz.open(dirname)
if os.path.exists('result.blz'): shutil.rmtree('result.blz')
filtered = blz.array([], dshape=X.datashape,
params=blz.params(storage='result.blz'))
starts = window_size * [0] + range(1, NROWS - window_size + 1)
for i in range(NROWS):
start = starts[i]
partial = (X[start:i + 1]).mean()
filtered.append([partial])
filtered.commit()
return filtered
def build_array(array_name, rows):
if not os.path.exists(array_name):
ds = 'x, float'
p = params(clevel=5, storage=array_name)
t = fromiter((0.1*i for i in xrange(rows)),
dshape=ds, params=p)
t.commit()
else:
t = open(array_name)
return t
def sliding_window_blz(dirname, window_size):
X = blz.open(dirname)
if os.path.exists('result.blz'): shutil.rmtree('result.blz')
filtered = blz.array([],
dshape=X.datashape,
params=blz.params(storage='result.blz'))
starts = window_size * [0] + range(1, NROWS - window_size + 1)
for i in range(NROWS):
start = starts[i]
partial = (X[start:i + 1]).mean()
filtered.append([partial])
filtered.commit()
return filtered
def build_table(table_name, rows):
"""build the table to use in our example.
if already built just open it"""
if not os.path.exists(table_name):
ds = 'x, {i: int64; f: float64}'
p = params(clevel=5, storage=table_name)
t = Table([], dshape=ds, params=p)
for i in xrange(rows):
t.append((i, random()))
t.commit()
else:
t = open(table_name)
return t
def test_object_persistent_blob_reopen():
td = tempfile.mkdtemp()
tmppath = os.path.join(td, 'c')
ds = blaze.dshape('x, blob')
c = blaze.Array([(i, "s"*i) for i in range(10)], ds,
params=blaze.params(storage=tmppath))
c2 = blaze.open(tmppath)
for i, v in enumerate(c2):
assert v[0] == i
assert v[1] == "s"*i
# Remove everything under the temporary dir
shutil.rmtree(td)
def build_table(table_name, rows):
"""build the table to use in our example.
if already built just open it"""
if not os.path.exists(table_name):
ds = 'x, {i: int64; f: float64}'
p = params(clevel=5, storage=table_name)
t = Table([], dshape=ds, params=p)
for i in xrange(rows):
t.append((i, random()))
t.commit()
else:
t = open(table_name)
return t
def test_perserve():
shape = (3, 4)
arr = np.ones(shape)
dshape = "%s,%s, float64" % (shape[0], shape[1])
path = "p.blz"
if os.path.exists(path):
shutil.rmtree(path)
bparams = blz.params(storage=path)
barray = blz.Array(arr, dshape, params=bparams)
print "barray:", repr(barray)
barray2 = blz.open(path)
print "barray2:", repr(barray2)
assert (str(barray.datashape) == str(barray2.datashape))
def test_perserve():
shape = (3,4)
arr = np.ones(shape)
dshape = "%s,%s, float64" % (shape[0], shape[1])
path = "p.blz"
if os.path.exists(path):
shutil.rmtree(path)
bparams = blz.params(storage=path)
barray = blz.Array(arr, dshape, params=bparams)
print "barray:", repr(barray)
barray2 = blz.open(path)
print "barray2:", repr(barray2)
assert(str(barray.datashape) == str(barray2.datashape))
def test_object_persistent_blob_reopen():
td = tempfile.mkdtemp()
tmppath = os.path.join(td, 'c')
ds = blaze.dshape('x, blob')
c = blaze.Array([(i, "s" * i) for i in range(10)],
ds,
params=blaze.params(storage=tmppath))
c2 = blaze.open(tmppath)
for i, v in enumerate(c2):
assert v[0] == i
assert v[1] == "s" * i
# Remove everything under the temporary dir
shutil.rmtree(td)
def test_getitem_nd_persistent():
import tempfile, shutil, os.path
td = tempfile.mkdtemp()
path = os.path.join(td, 'test.blz')
# write
bparams = params(storage=path, clevel=6)
nd = ndarr()
barray = Array(nd, params=bparams)
# read
arr = open(path)
data = arr[:]
assert np.all(data == nd)
shutil.rmtree(td)
def test_getitem_nd_persistent():
import tempfile, shutil, os.path
td = tempfile.mkdtemp()
path = os.path.join(td, 'test.blz')
# write
bparams = params(storage=path, clevel=6)
nd = ndarr()
barray = Array(nd, params=bparams)
# read
arr = open(path)
data = arr[:]
assert np.all(data == nd)
shutil.rmtree(td)
def test_simple():
if not os.path.exists('./noaa_data'):
p = params(clevel=5, storage='./noaa_data')
t = Table([], dshape='{f0: int, f1:int, f2:int, f3:float}', params=p)
# TODO: chunkwise copy
t.append(adapter[:])
t.commit()
else:
t = open('ctable://noaa_data')
print '--------------------------------------'
print 'mean', mean(t, 'f3')
print 'std', std(t, 'f2')
print '--------------------------------------'
qs1 = select(t, lambda x: x > 80000, 'f0')
qs2 = select2(t, lambda x, y: x > y, ['f0', 'f1'])
result = t[qs1]
def test_simple():
if not os.path.exists('./noaa_data'):
p = params(clevel=5, storage='./noaa_data')
t = Table([], dshape='{f0: int, f1:int, f2:int, f3:float}', params=p)
# TODO: chunkwise copy
t.append(adapter[:])
t.commit()
else:
t = open('ctable://noaa_data')
print '--------------------------------------'
print 'mean', mean(t, 'f3')
print 'std', std(t, 'f2')
print '--------------------------------------'
qs1 = select(t, lambda x: x > 80000, 'f0')
qs2 = select2(t, lambda x,y: x > y, ['f0', 'f1'])
result = t[qs1]
def test_open(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=json_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), [1, 2, 3, 4, 5])
def test_deprecated_open(self):
url = "csv://" + self.fname
store = blaze.Storage(url, mode='r')
a = blaze.open(store, schema=csv_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
def test_open(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=json_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), [1, 2, 3, 4, 5])
del describe_array
# --------------------------------------------------------------------
print_section('Persisted arrays')
def maybe_remove(persist):
import os.path
if os.path.exists(persist.path):
# Remove every directory starting with rootdir
blaze.drop(persist)
# Create an empty array on-disk
dname = 'blz://persisted.blz'
store = blaze.Storage(dname)
maybe_remove(store)
p = blaze.zeros('0, float64', storage=store)
# Feed it with some data
blaze.append(p, range(10))
print('Before re-opening:', p)
# Re-open the dataset in URI
p2 = blaze.open(store)
print('After re-opening:', p2)
blaze.drop(dname)
del describe_array
# --------------------------------------------------------------------
print_section('Persisted arrays')
def maybe_remove(persist):
import os.path
if os.path.exists(persist.path):
# Remove every directory starting with rootdir
blaze.drop(persist)
# Create an empty array on-disk
dname = 'blz://persisted.blz'
store = blaze.Storage(dname)
maybe_remove(store)
p = blaze.zeros('0, float64', storage=store)
# Feed it with some data
blaze.append(p, range(10))
print('Before re-opening:', p)
# Re-open the dataset in URI
p2 = blaze.open(store)
print('After re-opening:', p2)
blaze.drop(dname)
def test_open_has_header(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=csv_schema, has_header=False)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
N = 500
if os.path.exists('c'):
shutil.rmtree('c')
t0 = time()
c = blaze.Array([], 'x, object', params=blaze.params(storage='c', clevel=5))
for i in xrange(N):
c.append(u"s"*N*i)
c.commit()
print "time taken for writing in Blaze: %.3f" % (time() - t0)
t0 = time()
c2 = blaze.open('c')
#c2 = c
#print c2.datashape
tlen = 0
for i in range(N):
#print "i:", i, repr(c2[i]), type(c2[i])
tlen += len(c2[i][()])
print "time taken for reading in Blaze: %.3f" % (time() - t0)
print "tlen", tlen
# Create a VLArray:
t0 = time()
f = tables.openFile('vlarray.h5', mode='w')
vlarray = f.createVLArray(f.root, 'vlarray',
x = np.linspace(i*math.pi, (i+1)*math.pi, CS)
ts.append(x*np.sin(x))
ts.commit()
# Create a dataset to query
if os.path.exists('query.blz'): shutil.rmtree('query.blz')
xq = np.linspace(3*math.pi, 4*math.pi, CS)
query = blz.array(xq*np.sin(xq), params=blz.params(storage='query.blz'))
if os.path.exists('query2.blz'): shutil.rmtree('query2.blz')
n = np.random.randn(query.size)*.1 # introduce some noise
query2 = blz.array(xq*np.sin(xq)+n, params=blz.params(storage='query2.blz'))
if timing: print "Total Blaze arrays create time :", round(time()-t0, 4)
t0 = time()
# Open Blaze arrays on-disk (will not be loaded in memory)
ts = blz.open("ts.blz")
query = blz.open("query.blz")
query2 = blz.open("query2.blz")
if timing: print "Total Blaze arrays open time :", round(time()-t0, 4)
print "query size:", query.size
# Do the search for the exact pattern
print " *** Querying *exact* pattern ***"
t0 = time()
loc, dist = ucr.dtw(ts, query, 0.1, query.size, verbose=False)
print "Location : ", loc
print "Distance : ", dist
print "Data Scanned : ", ts.size
if timing: print "Total Execution Time (exact):", round(time()-t0, 4)
# Do the search for the noisy pattern
N = 500
if os.path.exists('c'):
shutil.rmtree('c')
t0 = time()
c = blaze.Array([], 'x, object', params=blaze.params(storage='c', clevel=5))
for i in xrange(N):
c.append(u"s" * N * i)
c.commit()
print "time taken for writing in Blaze: %.3f" % (time() - t0)
t0 = time()
c2 = blaze.open('c')
#c2 = c
#print c2.datashape
tlen = 0
for i in range(N):
#print "i:", i, repr(c2[i]), type(c2[i])
tlen += len(c2[i][()])
print "time taken for reading in Blaze: %.3f" % (time() - t0)
print "tlen", tlen
# Create a VLArray:
t0 = time()
f = tables.openFile('vlarray.h5', mode='w')
vlarray = f.createVLArray(f.root,
'vlarray',
def test_open_has_header(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=csv_schema, has_header=False)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
def test_append(self):
store = blaze.Storage(self.url, mode='r+')
a = blaze.open(store, schema=csv_schema)
blaze.append(a, ["k4", "v4", 4, True])
self.assertEqual(dd_as_py(a._data), csv_ldict + \
[{u'f0': u'k4', u'f1': u'v4', u'f2': 4, u'f3': True}])
print_section('building basic hdf5 files')
# Create a simple HDF5 file
a1 = np.array([[1, 2, 3], [4, 5, 6]], dtype="int32")
a2 = np.array([[1, 2, 3], [3, 2, 1]], dtype="int64")
t1 = np.array([(1, 2, 3), (3, 2, 1)], dtype="i4,i8,f8")
with tb.open_file(fname, "w") as f:
f.create_array(f.root, 'a1', a1)
f.create_table(f.root, 't1', t1)
f.create_group(f.root, 'g')
f.create_array(f.root.g, 'a2', a2)
print("Created HDF5 file with the next contents:\n%s" % str(f))
print_section('opening and handling datasets in hdf5 files')
# Open an homogeneous dataset there
store = blaze.Storage(fname, format='hdf5')
a = blaze.open(store, datapath="/a1")
# Print it
print("/a1 contents:", a)
# Print the datashape
print("datashape for /a1:", a.dshape)
# Open another homogeneous dataset there
store = blaze.Storage(fname, format='hdf5')
a = blaze.open(store, datapath="/g/a2")
# Print it
print("/g/a2 contents:", a)
# Print the datashape
print("datashape for /g/a2:", a.dshape)
# Now, get an heterogeneous dataset
store = blaze.Storage(fname, format='hdf5')
def test_deprecated_open(self):
url = "csv://" + self.fname
store = blaze.Storage(url, mode='r')
a = blaze.open(store, schema=csv_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
def test_deprecated_open(self):
url = "json://" + self.fname
store = blaze.Storage(url, mode='r')
a = blaze.open(store, schema=json_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), [1, 2, 3, 4, 5])
def test_open_dialect(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=csv_schema, dialect='excel')
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
# Convert txt file into Blaze native format
def convert(filetxt, storage):
import os.path
if not os.path.exists(storage):
blaze.Array(np.loadtxt(filetxt),
params=blaze.params(storage=storage))
# Make sure that data is converted into a persistent Blaze array
convert("Data.txt", "Data")
convert("Query.txt", "Query")
convert("Query2.txt", "Query2")
t0 = time()
# Open Blaze arrays on-disk (will not be loaded in memory)
data = blaze.open("Data")
query = blaze.open("Query")
query2 = blaze.open("Query2")
print "Total Blaze arrays open time :", round(time()-t0, 4)
t0 = time()
# Do different searches using ED/DTW with native Blaze arrays
#loc, dist = ucr.ed(data, query, 128)
loc, dist = ucr.dtw(data, query, 0.1, 128, verbose=False)
#loc, dist = ucr.dtw(data, query2, 0.1, 128)
print "Location : ", loc
print "Distance : ", dist
print "Data Scanned : ", data.size
print "Total Execution Time :", round(time()-t0, 4)
'''Sample module showing how to read JSON files into blaze arrays'''
from __future__ import absolute_import, division, print_function
import blaze
from blaze.datadescriptor import dd_as_py
json_buf = u"[1, 2, 3, 4, 5]"
json_schema = "var, int8"
# Create a temporary JSON file in URI and open the dataset
dname = '/tmp/test.json'
store = blaze.Storage(dname)
print "store:", store
with file(store.path, "wb") as f:
f.write(json_buf)
arr = blaze.open(store, json_schema)
#print('Blaze array:', arr) # XXX This does not work yet
#print('Blaze array:', nd.array(arr)) # XXX idem
# Convert the data to a native Python object
print('Blaze array:', dd_as_py(arr._data))
# Remove the temporary JSON file
blaze.drop(store)
'''Sample module showing how to read CSV files into blaze arrays'''
from __future__ import absolute_import, division, print_function
import blaze
from blaze.datadescriptor import dd_as_py
# A CSV toy example
csv_buf = u"""k1,v1,1,False
k2,v2,2,True
k3,v3,3,False
"""
csv_schema = "{ f0: string; f1: string; f2: int16; f3: bool }"
# Create a temporary CSV file in URI and open the dataset
dname = '/tmp/test.csv'
store = blaze.Storage(dname)
print "store:", store
with file(store.path, "wb") as f:
f.write(csv_buf)
arr = blaze.open(store, csv_schema)
#print('Blaze array:', arr) # XXX This does not work yet
#print('Blaze array:', nd.array(arr)) # XXX idem
# Convert the data to a native Python object
print('Blaze array:', dd_as_py(arr._data))
# Remove the temporary CSV file
blaze.drop(store)
# Convert txt file into Blaze native format
def convert(filetxt, storage):
import os.path
if not os.path.exists(storage):
blaze.Array(np.loadtxt(filetxt), params=blaze.params(storage=storage))
# Make sure that data is converted into a persistent Blaze array
convert("Data.txt", "Data")
convert("Query.txt", "Query")
convert("Query2.txt", "Query2")
t0 = time()
# Open Blaze arrays on-disk (will not be loaded in memory)
data = blaze.open("Data")
query = blaze.open("Query")
query2 = blaze.open("Query2")
print "Total Blaze arrays open time :", round(time() - t0, 4)
t0 = time()
# Do different searches using ED/DTW with native Blaze arrays
#loc, dist = ucr.ed(data, query, 128)
loc, dist = ucr.dtw(data, query, 0.1, 128, verbose=False)
#loc, dist = ucr.dtw(data, query2, 0.1, 128)
print "Location : ", loc
print "Distance : ", dist
print "Data Scanned : ", data.size
print "Total Execution Time :", round(time() - t0, 4)
def test_open_dialect(self):
store = blaze.Storage(self.url, mode='r')
a = blaze.open(store, schema=csv_schema, dialect='excel')
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), csv_ldict)
'''Sample module showing how to read JSON files into blaze arrays'''
from __future__ import absolute_import, division, print_function
import blaze
from blaze.datadescriptor import dd_as_py
#from dynd import nd
json_buf = u"[1, 2, 3, 4, 5]"
json_schema = "var, int8"
# Create a temporary JSON file in URI and open the dataset
dname = 'json:///tmp/test.json'
store = blaze.Storage(dname)
print "store:", store
with file(store.path, "wb") as f:
f.write(json_buf)
arr = blaze.open(store, json_schema)
#print('Blaze array:', arr) # XXX This does not work yet
#print('Blaze array:', nd.array(arr)) # XXX idem
# Convert the data to a native Python object
print('Blaze array:', dd_as_py(arr._data))
# Remove the temporary JSON file
blaze.drop(store)
def test_append(self):
store = blaze.Storage(self.url, mode='r+')
a = blaze.open(store, schema=csv_schema)
blaze.append(a, ["k4", "v4", 4, True])
self.assertEqual(dd_as_py(a._data), csv_ldict + \
[{u'f0': u'k4', u'f1': u'v4', u'f2': 4, u'f3': True}])
def test_sqlite():
from blaze import open
a = open('sqlite://')
'''Sample module showing how to read CSV files into blaze arrays'''
import blaze
from blaze.datadescriptor import dd_as_py
#from dynd import nd
# A CSV toy example
csv_buf = u"""k1,v1,1,False
k2,v2,2,True
k3,v3,3,False
"""
csv_schema = "{ f0: string; f1: string; f2: int16; f3: bool }"
# Create a temporary CSV file in URI and open the dataset
dname = 'csv:///tmp/test.csv'
store = blaze.Storage(dname)
print "store:", store
with file(store.path, "wb") as f:
f.write(csv_buf)
arr = blaze.open(store, csv_schema)
#print('Blaze array:', arr) # XXX This does not work yet
#print('Blaze array:', nd.array(arr)) # XXX idem
# Convert the data to a native Python object
print('Blaze array:', dd_as_py(arr._data))
# Remove the temporary CSV file
blaze.drop(store)
#------------------------------------------------------------------------
if not os.path.exists(STORAGE):
print 'Creating tables'
N = 100000
a = carray(np.arange(N, dtype='i4'))
b = carray(np.arange(N, dtype='f8')+1)
t = ctable((a, b), ('f0', 'f1'), rootdir='example1', mode='w')
t.flush()
#------------------------------------------------------------------------
from time import time
print '-------------------'
t = blaze.open('ctable://example1')
# Using chunked blaze array we can optimize for IO doing the sum
# operations chunkwise from disk.
t0 = time()
print blaze.mean(t, 'f0')
print "Chunked mean", round(time()-t0, 6)
# Using NumPy is just going to through the iterator protocol on
# carray which isn't going to efficient.
t0 = time()
print np.mean(t.data.ca['f0'])
print "NumPy mean", round(time()-t0, 6)
print_section('building basic hdf5 files')
# Create a simple HDF5 file
a1 = np.array([[1, 2, 3], [4, 5, 6]], dtype="int32")
a2 = np.array([[1, 2, 3], [3, 2, 1]], dtype="int64")
t1 = np.array([(1, 2, 3), (3, 2, 1)], dtype="i4,i8,f8")
with tb.open_file(fname, "w") as f:
f.create_array(f.root, 'a1', a1)
f.create_table(f.root, 't1', t1)
f.create_group(f.root, 'g')
f.create_array(f.root.g, 'a2', a2)
print("Created HDF5 file with the next contents:\n%s" % str(f))
print_section('opening and handling datasets in hdf5 files')
# Open an homogeneous dataset there
store = blaze.Storage(fname, format='hdf5')
a = blaze.open(store, datapath="/a1")
# Print it
print("/a1 contents:", a)
# Print the datashape
print("datashape for /a1:", a.dshape)
# Open another homogeneous dataset there
store = blaze.Storage(fname, format='hdf5')
a = blaze.open(store, datapath="/g/a2")
# Print it
print("/g/a2 contents:", a)
# Print the datashape
print("datashape for /g/a2:", a.dshape)
# Now, get an heterogeneous dataset
store = blaze.Storage(fname, format='hdf5')
def test_deprecated_open(self):
url = "json://" + self.fname
store = blaze.Storage(url, mode='r')
a = blaze.open(store, schema=json_schema)
self.assert_(isinstance(a, blaze.Array))
self.assertEqual(dd_as_py(a._data), [1, 2, 3, 4, 5])