def testLogSpace(self):
array_transforms = [
lambda x: x, # Identity,
tf.convert_to_tensor,
np.array,
lambda x: np.array(x, dtype=np.float32),
lambda x: np.array(x, dtype=np.float64),
array_ops.array,
lambda x: array_ops.array(x, dtype=np.float32),
lambda x: array_ops.array(x, dtype=np.float64)
]
def run_test(start, stop, **kwargs):
for fn1 in array_transforms:
for fn2 in array_transforms:
arg1 = fn1(start)
arg2 = fn2(stop)
self.match(math_ops.logspace(arg1, arg2, **kwargs),
np.logspace(arg1, arg2, **kwargs),
msg='logspace({}, {})'.format(arg1, arg2),
almost=True)
run_test(0, 5)
run_test(0, 5, num=10)
run_test(0, 5, endpoint=False)
run_test(0, 5, base=2.0)
run_test(0, -5)
run_test(0, -5, num=10)
run_test(0, -5, endpoint=False)
run_test(0, -5, base=2.0)
def _testReduce(self, math_fun, np_fun, name):
axis_transforms = [
lambda x: x, # Identity,
tf.convert_to_tensor,
np.array,
array_ops.array,
lambda x: array_ops.array(x, dtype=np.float32),
lambda x: array_ops.array(x, dtype=np.float64),
]
def run_test(a, **kwargs):
axis = kwargs.pop('axis', None)
for fn1 in self.array_transforms:
for fn2 in axis_transforms:
arg1 = fn1(a)
axis_arg = fn2(axis) if axis is not None else None
self.match(math_fun(arg1, axis=axis_arg, **kwargs),
np_fun(arg1, axis=axis, **kwargs),
msg='{}({}, axis={}, keepdims={})'.format(
name, arg1, axis, kwargs.get('keepdims')))
run_test(5)
run_test([2, 3])
run_test([[2, -3], [-6, 7]])
run_test([[2, -3], [-6, 7]], axis=0)
run_test([[2, -3], [-6, 7]], axis=0, keepdims=True)
run_test([[2, -3], [-6, 7]], axis=1)
run_test([[2, -3], [-6, 7]], axis=1, keepdims=True)
run_test([[2, -3], [-6, 7]], axis=(0, 1))
run_test([[2, -3], [-6, 7]], axis=(1, 0))
def linspace(start, stop, num=50, endpoint=True, retstep=False, dtype=float):
if dtype:
dtype = utils.result_type(dtype)
start = array_ops.array(start, dtype=dtype)
stop = array_ops.array(stop, dtype=dtype)
if num == 0:
return empty(dtype)
if num < 0:
raise ValueError(
'Number of samples {} must be non-negative.'.format(num))
step = np.nan
if endpoint:
result = tf.linspace(start.data, stop.data, num)
if num > 1:
step = (stop - start) / (num - 1)
else:
# tf.linspace does not support endpoint=False so we manually handle it
# here.
if num > 1:
step = (stop - start) / num
result = tf.linspace(start.data, (stop - step).data, num)
else:
result = tf.linspace(start.data, stop.data, num)
if dtype:
result = tf.cast(result, dtype)
if retstep:
return arrays.tensor_to_ndarray(result), step
else:
return arrays.tensor_to_ndarray(result)
def test_setitem(self):
# Single integer index.
a = array_ops.array([1., 2., 3.])
b = array_ops.array(5.)
c = array_ops.array(10.)
tensors = [arr.data for arr in [a, b, c]]
with tf.GradientTape() as g:
g.watch(tensors)
a[1] = b + c
loss = array_ops.sum(a)
gradients = g.gradient(loss.data, tensors)
self.assertSequenceEqual(
array_ops.array(gradients[0]).tolist(), [1., 0., 1.])
self.assertEqual(array_ops.array(gradients[1]).tolist(), 1.)
self.assertEqual(array_ops.array(gradients[2]).tolist(), 1.)
# Tuple index.
a = array_ops.array([[[1., 2.], [3., 4.]], [[5., 6.],
[7., 8.]]]) # 2x2x2 array.
b = array_ops.array([10., 11.])
tensors = [arr.data for arr in [a, b]]
with tf.GradientTape() as g:
g.watch(tensors)
a[(1, 0)] = b
loss = array_ops.sum(a)
gradients = g.gradient(loss.data, tensors)
self.assertSequenceEqual(
array_ops.array(gradients[0]).tolist(),
[[[1., 1.], [1., 1.]], [[0., 0.], [1., 1.]]])
self.assertEqual(array_ops.array(gradients[1]).tolist(), [1., 1.])
def nan_reduction(a, axis=None, dtype=None, keepdims=False):
a = array_ops.array(a)
v = array_ops.array(init_val, dtype=a.dtype)
return reduction(array_ops.where(isnan(a), v, a),
axis=axis,
dtype=dtype,
keepdims=keepdims)
def _bin_op(tf_fun, a, b, promote=True):
if promote:
a, b = array_ops._promote_dtype(a, b) # pylint: disable=protected-access
else:
a = array_ops.array(a)
b = array_ops.array(b)
return utils.tensor_to_ndarray(tf_fun(a.data, b.data))
def average(a, axis=None, weights=None, returned=False): # pylint: disable=missing-docstring
if axis is not None and not isinstance(axis, six.integer_types):
# TODO(wangpeng): Support tuple of ints as `axis`
raise ValueError('`axis` must be an integer. Tuple of ints is not '
'supported yet. Got type: %s' % type(axis))
a = array_ops.array(a)
if weights is None: # Treat all weights as 1
if not np.issubdtype(a.dtype, np.inexact):
a = a.astype(
utils.result_type(a.dtype, dtypes.default_float_type()))
avg = tf.reduce_mean(a.data, axis=axis)
if returned:
if axis is None:
weights_sum = tf.size(a.data)
else:
weights_sum = tf.shape(a.data)[axis]
weights_sum = tf.cast(weights_sum, a.data.dtype)
else:
if np.issubdtype(a.dtype, np.inexact):
out_dtype = utils.result_type(a.dtype, weights)
else:
out_dtype = utils.result_type(a.dtype, weights,
dtypes.default_float_type())
a = array_ops.array(a, out_dtype).data
weights = array_ops.array(weights, out_dtype).data
def rank_equal_case():
tf.debugging.Assert(
tf.reduce_all(tf.shape(a) == tf.shape(weights)),
[tf.shape(a), tf.shape(weights)])
weights_sum = tf.reduce_sum(weights, axis=axis)
avg = tf.reduce_sum(a * weights, axis=axis) / weights_sum
return avg, weights_sum
if axis is None:
avg, weights_sum = rank_equal_case()
else:
def rank_not_equal_case():
tf.debugging.Assert(tf.rank(weights) == 1, [tf.rank(weights)])
weights_sum = tf.reduce_sum(weights)
axes = tf.convert_to_tensor([[axis], [0]])
avg = tf.tensordot(a, weights, axes) / weights_sum
return avg, weights_sum
# We condition on rank rather than shape equality, because if we do the
# latter, when the shapes are partially unknown but the ranks are known
# and different, utils.cond will run shape checking on the true branch,
# which will raise a shape-checking error.
avg, weights_sum = utils.cond(
tf.rank(a) == tf.rank(weights), rank_equal_case,
rank_not_equal_case)
avg = array_ops.array(avg)
if returned:
weights_sum = array_ops.broadcast_to(weights_sum, tf.shape(avg.data))
return avg, weights_sum
return avg
def _comparison(tf_fun, x1, x2, cast_bool_to_int=False):
dtype = utils.result_type(x1, x2)
# Cast x1 and x2 to the result_type if needed.
x1 = array_ops.array(x1, dtype=dtype)
x2 = array_ops.array(x2, dtype=dtype)
x1 = x1.data
x2 = x2.data
if cast_bool_to_int and x1.dtype == tf.bool:
x1 = tf.cast(x1, tf.int32)
x2 = tf.cast(x2, tf.int32)
return utils.tensor_to_ndarray(tf_fun(x1, x2))
def setUp(self):
super(MathTest, self).setUp()
self.array_transforms = [
lambda x: x, # Identity,
tf.convert_to_tensor,
np.array,
lambda x: np.array(x, dtype=np.float32),
lambda x: np.array(x, dtype=np.float64),
array_ops.array,
lambda x: array_ops.array(x, dtype=np.float32),
lambda x: array_ops.array(x, dtype=np.float64),
]
self.types = [np.int32, np.int64, np.float32, np.float64]
def tile(a, reps):
a = array_ops.array(a).data
reps = array_ops.array(reps, dtype=tf.int32).reshape([-1]).data
a_rank = tf.rank(a)
reps_size = tf.size(reps)
reps = tf.pad(reps, [[tf.math.maximum(a_rank - reps_size, 0), 0]],
constant_values=1)
a_shape = tf.pad(tf.shape(a),
[[tf.math.maximum(reps_size - a_rank, 0), 0]],
constant_values=1)
a = tf.reshape(a, a_shape)
return arrays.tensor_to_ndarray(tf.tile(a, reps))
def testArgMaxArgMin(self):
data = [
0,
5,
[1],
[1, 2, 3],
[[1, 2, 3]],
[[4, 6], [7, 8]],
[[[4, 6], [9, 10]], [[7, 8], [12, 34]]],
]
for fn, d in itertools.product(self.array_transforms, data):
arr = fn(d)
self.match(math_ops.argmax(arr), np.argmax(arr))
self.match(math_ops.argmin(arr), np.argmin(arr))
if hasattr(arr, 'shape'):
ndims = len(arr.shape)
else:
ndims = array_ops.array(arr, copy=False).ndim
if ndims == 0:
# Numpy flattens the scalar ndarray and treats it as a 1-d array of
# size 1.
ndims = 1
for axis in range(-ndims, ndims):
self.match(math_ops.argmax(arr, axis=axis),
np.argmax(arr, axis=axis))
self.match(math_ops.argmin(arr, axis=axis),
np.argmin(arr, axis=axis))
def _argminmax(fn, a, axis=None):
a = array_ops.array(a)
if axis is None:
# When axis is None numpy flattens the array.
a_t = tf.reshape(a.data, [-1])
else:
a_t = array_ops.atleast_1d(a).data
return utils.tensor_to_ndarray(fn(input=a_t, axis=axis))
def concatenate(arys, axis=0):
if not isinstance(arys, (list, tuple)):
arys = [arys]
if not arys:
raise ValueError('Need at least one array to concatenate.')
dtype = utils.result_type(*arys)
arys = [array_ops.array(array, dtype=dtype).data for array in arys]
return arrays.tensor_to_ndarray(tf.concat(arys, axis))
def testIndexedSlices(self):
dtype = tf.int64
iss = tf.IndexedSlices(values=tf.ones([2, 3], dtype=dtype),
indices=tf.constant([1, 9]),
dense_shape=[10, 3])
a = array_ops.array(iss, copy=False)
expected = tf.scatter_nd([[1], [9]], tf.ones([2, 3], dtype=dtype),
[10, 3])
self.assertAllEqual(expected, a)
def run_test(a, b):
for fn in self.array_transforms:
arg1 = fn(a)
arg2 = fn(b)
self.match(math_fun(arg1, arg2),
np_fun(arg1, arg2),
msg='{}({}, {})'.format(name, arg1, arg2))
# Tests type promotion
for type_a in self.types:
for type_b in self.types:
if not check_promotion and type_a != type_b:
continue
arg1 = array_ops.array(a, dtype=type_a)
arg2 = array_ops.array(b, dtype=type_b)
self.match(math_fun(arg1, arg2),
np_fun(arg1, arg2),
msg='{}({}, {})'.format(name, arg1, arg2),
check_type=check_promotion_result_type)
def nanmean(a, axis=None, dtype=None, keepdims=None): # pylint: disable=missing-docstring
a = array_ops.array(a)
if np.issubdtype(a.dtype, np.bool_) or np.issubdtype(a.dtype, np.integer):
return array_ops.mean(a, axis=axis, dtype=dtype, keepdims=keepdims)
nan_mask = logical_not(isnan(a))
if dtype is None:
dtype = a.dtype
normalizer = array_ops.sum(
nan_mask, axis=axis, dtype=dtype, keepdims=keepdims)
return nansum(a, axis=axis, dtype=dtype, keepdims=keepdims) / normalizer
def nanmean(a, axis=None, dtype=None, keepdims=None):
a = array_ops.array(a)
if np.issubdtype(a.dtype, np.bool_) or np.issubdtype(a.dtype, np.integer):
return array_ops.mean(a, axis=axis, dtype=dtype, keepdims=keepdims)
nan_mask = logical_not(isnan(a))
normalizer = array_ops.sum(nan_mask,
axis=axis,
dtype=np.int64,
keepdims=keepdims)
return nansum(a, axis=axis, dtype=dtype, keepdims=keepdims) / normalizer
def setUp(self):
super(ArrayCreationTest, self).setUp()
python_shapes = [
0, 1, 2, (), (1, ), (2, ), (1, 2, 3), [], [1], [2], [1, 2, 3]
]
self.shape_transforms = [
lambda x: x, lambda x: np.array(x, dtype=int),
lambda x: array_ops.array(x, dtype=int), tf.TensorShape
]
self.all_shapes = []
for fn in self.shape_transforms:
self.all_shapes.extend([fn(s) for s in python_shapes])
if sys.version_info.major == 3:
# There is a bug of np.empty (and alike) in Python 3 causing a crash when
# the `shape` argument is an arrays.ndarray scalar (or tf.Tensor scalar).
def not_ndarray_scalar(s):
return not (isinstance(s, arrays.ndarray) and s.ndim == 0)
self.all_shapes = list(filter(not_ndarray_scalar, self.all_shapes))
self.all_types = [
int, float, np.int16, np.int32, np.int64, np.float16, np.float32,
np.float64
]
source_array_data = [
1,
5.5,
7,
(),
(8, 10.),
((), ()),
((1, 4), (2, 8)),
[],
[7],
[8, 10.],
[[], []],
[[1, 4], [2, 8]],
([], []),
([1, 4], [2, 8]),
[(), ()],
[(1, 4), (2, 8)],
]
self.array_transforms = [
lambda x: x,
tf.convert_to_tensor,
np.array,
array_ops.array,
]
self.all_arrays = []
for fn in self.array_transforms:
self.all_arrays.extend([fn(s) for s in source_array_data])
def run_test(arr, index, value):
for fn in self.array_transforms:
value_arg = fn(value)
tf_array = array_ops.array(arr)
np_array = np.array(arr)
tf_array[index] = value_arg
# TODO(srbs): "setting an array element with a sequence" is thrown
# if we do not wrap value_arg in a numpy array. Investigate how this can
# be avoided.
np_array[index] = np.array(value_arg)
self.match(tf_array, np_array)
def normal(key, shape, dtype=tf.float32):
"""Sample standard-normal random values.
Args:
key: not used since TF doesn't pass RNG states explicitly.
shape: the shape of the result.
dtype: the dtype of the result.
Returns:
Random values in standard-normal distribution.
"""
del key
return array(tf.random.normal(shape, dtype=dtype), copy=False)
def argsort(a, axis=-1, kind='quicksort', order=None): # pylint: disable=missing-docstring
# TODO(nareshmodi): make string tensors also work.
if kind not in ('quicksort', 'stable'):
raise ValueError("Only 'quicksort' and 'stable' arguments are supported.")
if order is not None:
raise ValueError("'order' argument to sort is not supported.")
stable = (kind == 'stable')
a = array_ops.array(a).data
def _argsort(a, axis, stable):
if axis is None:
a = tf.reshape(a, [-1])
axis = 0
return tf.argsort(a, axis, stable=stable)
tf_ans = tf.cond(
tf.rank(a) == 0, lambda: tf.constant([0]),
lambda: _argsort(a, axis, stable))
return array_ops.array(tf_ans, dtype=np.intp)
def sort(a, axis=-1, kind='quicksort', order=None): # pylint: disable=missing-docstring
if kind != 'quicksort':
raise ValueError("Only 'quicksort' is supported.")
if order is not None:
raise ValueError("'order' argument to sort is not supported.")
a = array_ops.array(a)
if axis is None:
result_t = tf.sort(tf.reshape(a.data, [-1]), 0)
return utils.tensor_to_ndarray(result_t)
else:
return utils.tensor_to_ndarray(tf.sort(a.data, axis))
def testDiag(self):
array_transforms = [
lambda x: x, # Identity,
tf.convert_to_tensor,
np.array,
lambda x: np.array(x, dtype=np.float32),
lambda x: np.array(x, dtype=np.float64),
array_ops.array,
lambda x: array_ops.array(x, dtype=np.float32),
lambda x: array_ops.array(x, dtype=np.float64)
]
def run_test(arr):
for fn in array_transforms:
arr = fn(arr)
self.match(array_ops.diag(arr),
np.diag(arr),
msg='diag({})'.format(arr))
for k in range(-3, 3):
self.match(array_ops.diag(arr, k),
np.diag(arr, k),
msg='diag({}, k={})'.format(arr, k))
# 2-d arrays.
run_test(np.arange(9).reshape((3, 3)).tolist())
run_test(np.arange(6).reshape((2, 3)).tolist())
run_test(np.arange(6).reshape((3, 2)).tolist())
run_test(np.arange(3).reshape((1, 3)).tolist())
run_test(np.arange(3).reshape((3, 1)).tolist())
run_test([[5]])
run_test([[]])
run_test([[], []])
# 1-d arrays.
run_test([])
run_test([1])
run_test([1, 2])
def linspace( # pylint: disable=missing-docstring
start,
stop,
num=50,
endpoint=True,
retstep=False,
dtype=float,
axis=0):
if dtype:
dtype = utils.result_type(dtype)
start = array_ops.array(start, dtype=dtype).data
stop = array_ops.array(stop, dtype=dtype).data
if num < 0:
raise ValueError(
'Number of samples {} must be non-negative.'.format(num))
step = tf.convert_to_tensor(np.nan)
if endpoint:
result = tf.linspace(start, stop, num, axis=axis)
if num > 1:
step = (stop - start) / (num - 1)
else:
# tf.linspace does not support endpoint=False so we manually handle it
# here.
if num > 1:
step = ((stop - start) / num)
new_stop = tf.cast(stop, step.dtype) - step
start = tf.cast(start, new_stop.dtype)
result = tf.linspace(start, new_stop, num, axis=axis)
else:
result = tf.linspace(start, stop, num, axis=axis)
if dtype:
result = tf.cast(result, dtype)
if retstep:
return arrays.tensor_to_ndarray(result), arrays.tensor_to_ndarray(step)
else:
return arrays.tensor_to_ndarray(result)
def bernoulli(key, mean=np.float32(0.5), shape=()):
"""Sample Bernoulli random values with given shape and mean.
Args:
key: a random key, not used in the TF backend (stored in graph).
mean: optional, an array_like broadcastable to `shape` for the mean of the
random variables (default 0.5).
shape: optional, a tuple of nonnegative integers representing the shape
(default scalar).
Returns:
A random array with the specified shape and boolean dtype.
"""
# TODO(wangpeng): convert types TF <-> numpy.
shape = shape or arrays.convert_to_tensor(value=mean).shape
return array(
tf.less(uniform(key, shape), mean), copy=False)
def uniform(key, shape, dtype=random.DEFAULT_RANDN_DTYPE, minval=0., maxval=1.):
"""Sample uniform random values in range [`minval`, `maxval`).
Args:
key: not used by this implementation.
shape: the shape of the result.
dtype: the dtype of the result.
minval: the minimal value (inclusive).
maxval: the maximal value (exclusive).
Returns:
An ndarray with shape `shape` and dtype `dtype`. Each value in the ndarray
is sampled uniformly randomly in range [`minval`, `maxval`).
"""
del key
return array(
tf.random.uniform(shape, dtype=dtype, minval=minval, maxval=maxval),
copy=False)
def _scalar(tf_fn, x, promote_to_float=False):
"""Computes the tf_fn(x) for each element in `x`.
Args:
tf_fn: function that takes a single Tensor argument.
x: array_like. Could be an ndarray, a Tensor or any object that can
be converted to a Tensor using `tf.convert_to_tensor`.
promote_to_float: whether to cast the argument to a float dtype
(`dtypes.default_float_type`) if it is not already.
Returns:
An ndarray with the same shape as `x`. The default output dtype is
determined by `dtypes.default_float_type`, unless x is an ndarray with a
floating point type, in which case the output type is same as x.dtype.
"""
x = array_ops.array(x)
if promote_to_float and not np.issubdtype(x.dtype, np.floating):
x = x.astype(dtypes.default_float_type())
return utils.tensor_to_ndarray(tf_fn(x.data))
def logical_not(x):
x = array_ops.array(x, dtype=np.bool_)
return utils.tensor_to_ndarray(tf.logical_not(x.data))
def f(x):
if isinstance(x, (tf.Tensor, tf.IndexedSlices)):
return array(x, copy=False)
else:
return x
def testArray(self):
ndmins = [0, 1, 2, 5]
for a, dtype, ndmin, copy in itertools.product(self.all_arrays,
self.all_types, ndmins,
[True, False]):
self.match(array_ops.array(a, dtype=dtype, ndmin=ndmin, copy=copy),
np.array(a, dtype=dtype, ndmin=ndmin, copy=copy))
zeros_list = array_ops.zeros(5)
# TODO(srbs): Test that copy=True when context.device is different from
# tensor device copies the tensor.
# Backing tensor is the same if copy=False, other attributes being None.
self.assertIs(
array_ops.array(zeros_list, copy=False).data, zeros_list.data)
self.assertIs(
array_ops.array(zeros_list.data, copy=False).data, zeros_list.data)
# Backing tensor is different if ndmin is not satisfied.
self.assertIsNot(
array_ops.array(zeros_list, copy=False, ndmin=2).data,
zeros_list.data)
self.assertIsNot(
array_ops.array(zeros_list.data, copy=False, ndmin=2).data,
zeros_list.data)
self.assertIs(
array_ops.array(zeros_list, copy=False, ndmin=1).data,
zeros_list.data)
self.assertIs(
array_ops.array(zeros_list.data, copy=False, ndmin=1).data,
zeros_list.data)
# Backing tensor is different if dtype is not satisfied.
self.assertIsNot(
array_ops.array(zeros_list, copy=False, dtype=int).data,
zeros_list.data)
self.assertIsNot(
array_ops.array(zeros_list.data, copy=False, dtype=int).data,
zeros_list.data)
self.assertIs(
array_ops.array(zeros_list, copy=False, dtype=float).data,
zeros_list.data)
self.assertIs(
array_ops.array(zeros_list.data, copy=False, dtype=float).data,
zeros_list.data)
