def test_categorical_compare_ordered(data):
cat1 = data[0]
cat2 = data[1]
pdsr1 = pd.Series(cat1)
pdsr2 = pd.Series(cat2)
sr1 = Series(cat1)
sr2 = Series(cat2)
dsr1 = dgd.from_pygdf(sr1, npartitions=2)
dsr2 = dgd.from_pygdf(sr2, npartitions=2)
# Test equality
out = dsr1 == dsr1
assert out.dtype == np.bool_
assert np.all(out.compute())
assert np.all(pdsr1 == pdsr1)
# Test inequality
out = dsr1 != dsr1
assert not np.any(out.compute())
assert not np.any(pdsr1 != pdsr1)
assert dsr1.cat.ordered
assert pdsr1.cat.ordered
# Test ordered operators
np.testing.assert_array_equal(pdsr1 < pdsr2, (dsr1 < dsr2).compute())
np.testing.assert_array_equal(pdsr1 > pdsr2, (dsr1 > dsr2).compute())
def test_join_left(left_nrows, right_nrows, left_nkeys, right_nkeys, how):
chunksize = 50
np.random.seed(0)
# PyGDF
left = gd.DataFrame({'x': np.random.randint(0, left_nkeys,
size=left_nrows),
'a': np.arange(left_nrows, dtype=np.float64)}.items())
right = gd.DataFrame({'x': np.random.randint(0, right_nkeys,
size=right_nrows),
'a': 1000 * np.arange(right_nrows,
dtype=np.float64)}.items())
expect = left.set_index('x').join(right.set_index('x'), how=how,
sort=True, lsuffix='l', rsuffix='r')
expect = expect.to_pandas()
# Dask GDf
left = dgd.from_pygdf(left, chunksize=chunksize)
right = dgd.from_pygdf(right, chunksize=chunksize)
joined = left.set_index('x').join(right.set_index('x'), how=how,
lsuffix='l', rsuffix='r')
got = joined.compute().to_pandas()
# Check index
np.testing.assert_array_equal(expect.index.values,
got.index.values)
# Check rows in each groups
expect_rows = {}
got_rows = {}
def gather(df, grows):
cola = np.sort(np.asarray(df.al))
colb = np.sort(np.asarray(df.ar))
grows[df['index'].values[0]] = (cola, colb)
expect.reset_index().groupby('index')\
.apply(partial(gather, grows=expect_rows))
expect.reset_index().groupby('index')\
.apply(partial(gather, grows=got_rows))
for k in expect_rows:
np.testing.assert_array_equal(expect_rows[k][0],
got_rows[k][0])
np.testing.assert_array_equal(expect_rows[k][1],
got_rows[k][1])
def test_assign():
np.random.seed(0)
df = pd.DataFrame({'x': np.random.randint(0, 5, size=20),
'y': np.random.normal(size=20)})
dgf = dgd.from_pygdf(gd.DataFrame.from_pandas(df), npartitions=2)
pdcol = pd.Series(np.arange(20) + 1000)
newcol = dgd.from_pygdf(gd.Series(pdcol),
npartitions=dgf.npartitions)
out = dgf.assign(z=newcol)
got = out.compute().to_pandas()
assert_frame_equal(got.loc[:, ['x', 'y']], df)
np.testing.assert_array_equal(got['z'], pdcol)
def test_categorical_compare_unordered(data):
cat = data.copy()
pdsr = pd.Series(cat)
sr = Series(cat)
dsr = dgd.from_pygdf(sr, npartitions=2)
# Test equality
out = dsr == dsr
assert out.dtype == np.bool_
assert np.all(out.compute())
assert np.all(pdsr == pdsr)
# Test inequality
out = dsr != dsr
assert not np.any(out.compute())
assert not np.any(pdsr != pdsr)
assert not dsr.cat.ordered.compute()
assert not pdsr.cat.ordered
with pytest.raises((TypeError, ValueError)) as raises:
pdsr < pdsr
raises.match("Unordered Categoricals can only compare equality or not")
with pytest.raises((TypeError, ValueError)) as raises:
dsr < dsr
raises.match("Unordered Categoricals can only compare equality or not")
def test_series_to_delayed():
nelem = 100
sr = gd.Series(np.random.randint(nelem, size=nelem))
dsr = dgd.from_pygdf(sr, npartitions=5)
delays = dsr.to_delayed()
assert len(delays) == 5
# Concat the delayed partitions
got = gd.concat([d.compute() for d in delays])
assert isinstance(got, gd.Series)
np.testing.assert_array_equal(got.to_pandas(), sr.to_pandas())
# Check individual partitions
divs = dsr.divisions
assert len(divs) == len(delays) + 1
for i, part in enumerate(delays):
s = divs[i]
# The last divisions in the last index
e = None if i + 1 == len(delays) else divs[i + 1]
expect = sr[s:e].to_pandas()
got = part.compute().to_pandas()
np.testing.assert_array_equal(got, expect)
def test_repeated_groupby():
np.random.seed(0)
nelem = 100
df = pd.DataFrame()
df['a'] = _gen_uniform_keys(nelem)
df['b'] = _gen_uniform_keys(nelem)
ref_df = gd.DataFrame.from_pandas(df)
df = dgd.from_pygdf(ref_df, npartitions=3)
assert df.known_divisions
df2 = df.groupby('a').apply(lambda x: x)
assert not df2.known_divisions
got = df2.groupby('a').apply(lambda x: x).compute().to_pandas()
expect = ref_df.groupby('a').apply(lambda x: x).to_pandas()
def sort_content(df):
return sorted(list(df.b))
got = got.groupby('a').apply(sort_content)
expect = expect.groupby('a').apply(sort_content)
pd.util.testing.assert_series_equal(got, expect)
def test_groupby_multi_keys(keygen):
np.random.seed(0)
nelem = 500
npartitions = 10
# Generate the keys
xs = keygen(nelem)
ys = keygen(nelem)
assert xs.size == nelem
assert ys.size == nelem
df = pd.DataFrame({
'x': xs,
'y': ys,
'z': np.random.normal(size=nelem) + 1
})
gdf = gd.DataFrame.from_pandas(df)
dgf = dgd.from_pygdf(gdf, npartitions=npartitions)
groups = dgf.groupby(by=['x', 'y']).count()
got = groups.compute().to_pandas()
# Check against expectation
expect = df.groupby(by=['x', 'y'], as_index=False).count()
# Check keys
np.testing.assert_array_equal(got.x, expect.x)
np.testing.assert_array_equal(got.y, expect.y)
# Check values
np.testing.assert_array_equal(got.z, expect.z)
def test_dataframe_to_delayed():
nelem = 100
df = gd.DataFrame()
df['x'] = np.arange(nelem)
df['y'] = np.random.randint(nelem, size=nelem)
ddf = dgd.from_pygdf(df, npartitions=5)
delays = ddf.to_delayed()
assert len(delays) == 5
# Concat the delayed partitions
got = gd.concat([d.compute() for d in delays])
assert_frame_equal(got.to_pandas(), df.to_pandas())
# Check individual partitions
divs = ddf.divisions
assert len(divs) == len(delays) + 1
for i, part in enumerate(delays):
s = divs[i]
# The last divisions in the last index
e = None if i + 1 == len(delays) else divs[i + 1]
expect = df[s:e].to_pandas()
got = part.compute().to_pandas()
assert_frame_equal(got, expect)
def test_categorical_basic(data):
cat = data.copy()
pdsr = pd.Series(cat)
sr = Series(cat)
dsr = dgd.from_pygdf(sr, npartitions=2)
result = dsr.compute()
np.testing.assert_array_equal(cat.codes, result.to_array())
assert dsr.dtype == pdsr.dtype
# Test attributes
assert pdsr.cat.ordered == dsr.cat.ordered.compute()
# TODO: Investigate dsr.cat.categories: It raises
# ValueError: Expected iterable of tuples of (name, dtype),
# got ('a', 'b', 'c')
# assert(tuple(pdsr.cat.categories) == tuple(dsr.cat.categories))
np.testing.assert_array_equal(pdsr.cat.codes.data, result.to_array())
np.testing.assert_array_equal(pdsr.cat.codes.dtype, dsr.cat.codes.dtype)
string = str(result)
expect_str = """
0 a
1 a
2 b
3 c
4 a
"""
assert all(x == y for x, y in zip(string.split(), expect_str.split()))
def test_dt_series(data, field):
pdsr = pd.Series(data.copy())
sr = Series(pdsr)
dsr = dgd.from_pygdf(sr, npartitions=5)
base = getattr(pdsr.dt, field)
test = getattr(dsr.dt, field).compute()\
.to_pandas().astype('int64')
assert_series_equal(base, test)
def test_head():
np.random.seed(0)
df = pd.DataFrame({'x': np.random.randint(0, 5, size=100),
'y': np.random.normal(size=100)})
gdf = gd.DataFrame.from_pandas(df)
dgf = dgd.from_pygdf(gdf, npartitions=2)
assert_frame_equal(dgf.head().to_pandas(), df.head())
def _make_random_frame(nelem, npartitions=2):
df = pd.DataFrame({
'x': np.random.randint(0, 5, size=nelem),
'y': np.random.normal(size=nelem) + 1
})
gdf = gd.DataFrame.from_pandas(df)
dgf = dgd.from_pygdf(gdf, npartitions=npartitions)
return df, dgf
def test_dt_series(data, field):
pd_data = pd.Series(data.copy())
gdf_data = Series(pd_data)
dask_gdf_data = dgd.from_pygdf(gdf_data, npartitions=5)
base = getattr(pd_data.dt, field)
test = getattr(dask_gdf_data.dt, field).compute()\
.to_pandas().astype('int64')
assert_series_equal(base, test)
def test_series(data):
pd_data = pd.Series(data.copy())
gdf_data = Series(pd_data)
dask_gdf_data = dgd.from_pygdf(gdf_data, npartitions=5)
np.testing.assert_equal(
np.array(pd_data),
np.array(dask_gdf_data.compute()),
)
def test_sort_values(nelem, nparts, by):
df = pygdf.DataFrame()
df['a'] = np.ascontiguousarray(np.arange(nelem)[::-1])
df['b'] = np.arange(100, nelem + 100)
ddf = dgd.from_pygdf(df, npartitions=nparts)
got = ddf.sort_values(by=by).compute().to_pandas()
expect = df.sort_values(by=by).to_pandas().reset_index(drop=True)
pd.util.testing.assert_frame_equal(got, expect)
def test_frame_extra_columns_error():
nelem = 20
df = gd.DataFrame()
df['x'] = np.arange(nelem)
df['y'] = np.random.randint(nelem, size=nelem)
ddf1 = dgd.from_pygdf(df, npartitions=5)
df['z'] = np.arange(nelem)
ddf2 = dgd.from_pygdf(df, npartitions=5)
combined = dgd.from_delayed(ddf1.to_delayed() + ddf2.to_delayed())
with pytest.raises(ValueError) as raises:
out = combined.compute()
raises.match(r"^Metadata mismatch found in `from_delayed`.")
raises.match(r"extra columns")
def test_series(data):
pdsr = pd.Series(data.copy())
sr = Series(pdsr)
dsr = dgd.from_pygdf(sr, npartitions=5)
np.testing.assert_equal(
np.array(pdsr),
np.array(dsr.compute()),
)
def test_join_inner(left_nrows, right_nrows, left_nkeys, right_nkeys):
chunksize = 50
np.random.seed(0)
# PyGDF
left = gd.DataFrame({'x': np.random.randint(0, left_nkeys,
size=left_nrows),
'a': np.arange(left_nrows)}.items())
right = gd.DataFrame({'x': np.random.randint(0, right_nkeys,
size=right_nrows),
'a': 1000 * np.arange(right_nrows)}.items())
expect = left.set_index('x').join(right.set_index('x'), how='inner',
sort=True, lsuffix='l', rsuffix='r')
expect = expect.to_pandas()
# Dask GDf
left = dgd.from_pygdf(left, chunksize=chunksize)
right = dgd.from_pygdf(right, chunksize=chunksize)
joined = left.set_index('x').join(right.set_index('x'), how='inner',
lsuffix='l', rsuffix='r')
got = joined.compute().to_pandas()
# Check index
np.testing.assert_array_equal(expect.index.values,
got.index.values)
# Check rows in each groups
expect_rows = {}
got_rows = {}
def gather(df, grows):
grows[df['index'].values[0]] = (set(df.al), set(df.ar))
expect.reset_index().groupby('index')\
.apply(partial(gather, grows=expect_rows))
expect.reset_index().groupby('index')\
.apply(partial(gather, grows=got_rows))
assert got_rows == expect_rows
def test_merge_left(left_nrows, right_nrows, left_nkeys, right_nkeys,
how='left'):
print(left_nrows, right_nrows, left_nkeys, right_nkeys)
chunksize = 3
np.random.seed(0)
# PyGDF
left = gd.DataFrame({'x': np.random.randint(0, left_nkeys,
size=left_nrows),
'y': np.random.randint(0, left_nkeys,
size=left_nrows),
'a': np.arange(left_nrows, dtype=np.float64)}.items())
right = gd.DataFrame({'x': np.random.randint(0, right_nkeys,
size=right_nrows),
'y': np.random.randint(0, right_nkeys,
size=right_nrows),
'a': 1000 * np.arange(right_nrows,
dtype=np.float64)}.items())
print(left.to_pandas())
print(right.to_pandas())
expect = left.merge(right, on=('x', 'y'), how=how)
expect = expect.to_pandas().sort_values(['x', 'y', 'a_x', 'a_y'])\
.reset_index(drop=True)
print("Expect".center(80, '='))
print(expect)
# Dask GDf
left = dgd.from_pygdf(left, chunksize=chunksize)
right = dgd.from_pygdf(right, chunksize=chunksize)
joined = left.merge(right, on=('x', 'y'), how=how)
print("Got".center(80, '='))
got = joined.compute().to_pandas()
got = got.sort_values(['x', 'y', 'a_x', 'a_y']).reset_index(drop=True)
print(got)
pd.util.testing.assert_frame_equal(expect, got)
def test_set_index_2(nelem):
np.random.seed(0)
df = pd.DataFrame({'x': 100 + np.random.randint(0, nelem//2, size=nelem),
'y': np.random.normal(size=nelem)})
expect = df.set_index('x').sort_index()
dgf = dgd.from_pygdf(gd.DataFrame.from_pandas(df), npartitions=4)
res = dgf.set_index('x') # sort by default
got = res.compute().to_pandas()
assert_frame_equal_by_index_group(expect, got)
def test_setitem_scalar_float(data_type):
np.random.seed(0)
scalar = np.random.randn(1).astype(data_type)[0]
df = pd.DataFrame({'x': np.random.randint(0, 5, size=20),
'y': np.random.normal(size=20)})
dgf = dgd.from_pygdf(gd.DataFrame.from_pandas(df), npartitions=2)
df['z'] = scalar
dgf['z'] = scalar
got = dgf.compute().to_pandas()
np.testing.assert_array_equal(got['z'], df['z'])
def test_setitem_scalar_datetime():
np.random.seed(0)
scalar = np.int64(np.random.randint(0, 100)).astype('datetime64[ms]')
df = pd.DataFrame({'x': np.random.randint(0, 5, size=20),
'y': np.random.normal(size=20)})
dgf = dgd.from_pygdf(gd.DataFrame.from_pandas(df), npartitions=2)
df['z'] = scalar
dgf['z'] = scalar
got = dgf.compute().to_pandas()
np.testing.assert_array_equal(got['z'], df['z'])
def test_frame_dtype_error():
nelem = 20
df1 = gd.DataFrame()
df1['bad'] = np.arange(nelem)
df1['bad'] = np.arange(nelem, dtype=np.float64)
df2 = gd.DataFrame()
df2['bad'] = np.arange(nelem)
df2['bad'] = np.arange(nelem, dtype=np.float32)
ddf1 = dgd.from_pygdf(df1, npartitions=5)
ddf2 = dgd.from_pygdf(df2, npartitions=5)
combined = dgd.from_delayed(ddf1.to_delayed() + ddf2.to_delayed())
with pytest.raises(ValueError) as raises:
combined.compute()
print("out")
raises.match(r"^Metadata mismatch found in `from_delayed`.")
raises.match(r"\s+\|\s+".join(['bad', 'float32', 'float64']))
def test_from_pygdf():
np.random.seed(0)
df = pd.DataFrame({'x': np.random.randint(0, 5, size=10000),
'y': np.random.normal(size=10000)})
gdf = gd.DataFrame.from_pandas(df)
# Test simple around to/from dask
ingested = dgd.from_pygdf(gdf, npartitions=2)
assert_frame_equal(ingested.compute().to_pandas(), df)
# Test conversion to dask.dataframe
ddf = ingested.to_dask_dataframe()
assert_frame_equal(ddf.compute(), df)
def test_groupby_apply_grouped():
np.random.seed(0)
nelem = 100
xs = _gen_uniform_keys(nelem)
ys = _gen_uniform_keys(nelem)
df = pd.DataFrame({
'x': xs,
'y': ys,
'idx': np.arange(nelem),
'v1': np.random.normal(size=nelem),
'v2': np.random.normal(size=nelem)
})
gdf = gd.DataFrame.from_pandas(df)
dgf = dgd.from_pygdf(gdf, npartitions=2)
def transform(y, v1, v2, out1):
for i in range(cuda.threadIdx.x, y.size, cuda.blockDim.x):
out1[i] = y[i] * (v1[i] + v2[i])
grouped = dgf.groupby(by=['x', 'y']).apply_grouped(
transform,
incols=['y', 'v1', 'v2'],
outcols={'out1': np.float64},
)
# Compute with dask
dgd_grouped = grouped.compute().to_pandas()
binning = {}
for _, row in dgd_grouped.iterrows():
binning[row.idx] = row
# Emulate the operation with pandas
def emulate(df):
df['out1'] = df.y * (df.v1 + df.v2)
return df
pd_groupby = df.groupby(by=['x', 'y'], sort=True,
as_index=True).apply(emulate)
# Check the result
for _, expect in pd_groupby.iterrows():
got = binning[expect.idx]
attrs = ['x', 'y', 'v1', 'v2', 'out1']
for a in attrs:
np.testing.assert_equal(getattr(got, a), getattr(expect, a))
def test_query():
np.random.seed(0)
df = pd.DataFrame({'x': np.random.randint(0, 5, size=10),
'y': np.random.normal(size=10)})
gdf = gd.DataFrame.from_pandas(df)
expr = 'x > 2'
assert_frame_equal(gdf.query(expr).to_pandas(), df.query(expr))
queried = (dgd.from_pygdf(gdf, npartitions=2).query(expr))
got = queried.compute().to_pandas()
expect = gdf.query(expr).to_pandas()
assert_frame_equal(got, expect)
def test_mixing_series_frame_error():
nelem = 20
df = gd.DataFrame()
df['x'] = np.arange(nelem)
df['y'] = np.random.randint(nelem, size=nelem)
ddf = dgd.from_pygdf(df, npartitions=5)
delay_frame = ddf.to_delayed()
delay_series = ddf.x.to_delayed()
combined = dgd.from_delayed(delay_frame + delay_series)
with pytest.raises(ValueError) as raises:
out = combined.compute()
raises.match(r"^Metadata mismatch found in `from_delayed`.")
raises.match(r"Expected partition of type `DataFrame` but got `Series`")
def test_append():
np.random.seed(0)
n = 1000
df = pd.DataFrame({'x': np.random.randint(0, 5, size=n),
'y': np.random.normal(size=n)})
gdf = gd.DataFrame.from_pandas(df)
frags = _fragmented_gdf(gdf, nsplit=13)
# Combine with .append
head = frags[0]
tail = frags[1:]
appended = dgd.from_pygdf(head, npartitions=1)
for each in tail:
appended = appended.append(each)
assert_frame_equal(df, appended.compute().to_pandas())
def test_series_append():
np.random.seed(0)
n = 1000
df = pd.DataFrame({'x': np.random.randint(0, 5, size=n),
'y': np.random.normal(size=n)})
gdf = gd.DataFrame.from_pandas(df)
frags = _fragmented_gdf(gdf, nsplit=13)
frags = [df.x for df in frags]
appending = dgd.from_pygdf(frags[0], npartitions=1)
for frag in frags[1:]:
appending = appending.append(frag)
appended = appending.compute().to_pandas()
assert isinstance(appended, pd.Series)
np.testing.assert_array_equal(appended, df.x)
def test_sort_values_binned():
np.random.seed(43)
nelem = 100
nparts = 5
by = 'a'
df = pygdf.DataFrame()
df['a'] = np.random.randint(1, 5, nelem)
ddf = dgd.from_pygdf(df, npartitions=nparts)
parts = ddf.sort_values_binned(by=by).to_delayed()
part_uniques = []
for i, p in enumerate(parts):
part = dask.compute(p)[0]
part_uniques.append(set(part.a.unique()))
# Partitions do not have intersecting keys
for i in range(len(part_uniques)):
for j in range(i + 1, len(part_uniques)):
assert not (part_uniques[i] & part_uniques[j]), \
"should have empty intersection"
