Author: Brian Kearns <bdkea...@gmail.com>
Branch:
Changeset: r69520:c4355a931db5
Date: 2014-02-27 08:28 -0500
http://bitbucket.org/pypy/pypy/changeset/c4355a931db5/
Log: kill MultiDimViewIterator
diff --git a/pypy/module/micronumpy/concrete.py
b/pypy/module/micronumpy/concrete.py
--- a/pypy/module/micronumpy/concrete.py
+++ b/pypy/module/micronumpy/concrete.py
@@ -283,9 +283,9 @@
self.get_backstrides(),
self.get_shape(), shape,
backward_broadcast)
- return iter.MultiDimViewIterator(self, self.start,
- r[0], r[1], shape)
- return iter.ArrayIterator(self)
+ return iter.ArrayIterator(self, shape, r[0], r[1])
+ return iter.ArrayIterator(self, self.shape, self.strides,
+ self.backstrides)
def create_axis_iter(self, shape, dim, cum):
return iter.AxisIterator(self, shape, dim, cum)
@@ -293,7 +293,7 @@
def create_dot_iter(self, shape, skip):
r = calculate_dot_strides(self.get_strides(), self.get_backstrides(),
shape, skip)
- return iter.MultiDimViewIterator(self, self.start, r[0], r[1], shape)
+ return iter.ArrayIterator(self, shape, r[0], r[1])
def swapaxes(self, space, orig_arr, axis1, axis2):
shape = self.get_shape()[:]
diff --git a/pypy/module/micronumpy/iter.py b/pypy/module/micronumpy/iter.py
--- a/pypy/module/micronumpy/iter.py
+++ b/pypy/module/micronumpy/iter.py
@@ -79,14 +79,17 @@
class ArrayIterator(object):
- def __init__(self, array):
+ _immutable_fields_ = ['array', 'start', 'size', 'ndim_m1', 'shape_m1',
+ 'strides', 'backstrides']
+
+ def __init__(self, array, shape, strides, backstrides):
self.array = array
self.start = array.start
- self.size = array.get_size()
- self.ndim_m1 = len(array.shape) - 1
- self.shape_m1 = [s - 1 for s in array.shape]
- self.strides = array.strides[:]
- self.backstrides = array.backstrides[:]
+ self.size = support.product(shape)
+ self.ndim_m1 = len(shape) - 1
+ self.shape_m1 = [s - 1 for s in shape]
+ self.strides = strides
+ self.backstrides = backstrides
self.reset()
def reset(self):
@@ -106,10 +109,24 @@
self.indices[i] = 0
self.offset -= self.backstrides[i]
+ @jit.unroll_safe
def next_skip_x(self, step):
- # XXX implement
- for _ in range(step):
- self.next()
+ assert step >= 0
+ if step == 0:
+ return
+ self.index += step
+ for i in range(self.ndim_m1, -1, -1):
+ if self.indices[i] < (self.shape_m1[i] + 1) - step:
+ self.indices[i] += step
+ self.offset += self.strides[i] * step
+ break
+ else:
+ remaining_step = (self.indices[i] + step) // (self.shape_m1[i]
+ 1)
+ this_i_step = step - remaining_step * (self.shape_m1[i] + 1)
+ self.indices[i] = self.indices[i] + this_i_step
+ self.offset += self.strides[i] * this_i_step
+ step = remaining_step
+ assert step > 0
def done(self):
return self.index >= self.size
@@ -124,56 +141,6 @@
self.array.setitem(self.offset, elem)
-class MultiDimViewIterator(ArrayIterator):
- def __init__(self, array, start, strides, backstrides, shape):
- self.indexes = [0] * len(shape)
- self.array = array
- self.shape = shape
- self.offset = start
- self.shapelen = len(shape)
- self._done = self.shapelen == 0 or support.product(shape) == 0
- self.strides = strides
- self.backstrides = backstrides
- self.size = array.size
-
- @jit.unroll_safe
- def next(self):
- offset = self.offset
- for i in range(self.shapelen - 1, -1, -1):
- if self.indexes[i] < self.shape[i] - 1:
- self.indexes[i] += 1
- offset += self.strides[i]
- break
- else:
- self.indexes[i] = 0
- offset -= self.backstrides[i]
- else:
- self._done = True
- self.offset = offset
-
- @jit.unroll_safe
- def next_skip_x(self, step):
- for i in range(len(self.shape) - 1, -1, -1):
- if self.indexes[i] < self.shape[i] - step:
- self.indexes[i] += step
- self.offset += self.strides[i] * step
- break
- else:
- remaining_step = (self.indexes[i] + step) // self.shape[i]
- this_i_step = step - remaining_step * self.shape[i]
- self.offset += self.strides[i] * this_i_step
- self.indexes[i] = self.indexes[i] + this_i_step
- step = remaining_step
- else:
- self._done = True
-
- def done(self):
- return self._done
-
- def reset(self):
- self.offset %= self.size
-
-
class AxisIterator(ArrayIterator):
def __init__(self, array, shape, dim, cumulative):
self.shape = shape
diff --git a/pypy/module/micronumpy/test/test_iter.py
b/pypy/module/micronumpy/test/test_iter.py
--- a/pypy/module/micronumpy/test/test_iter.py
+++ b/pypy/module/micronumpy/test/test_iter.py
@@ -1,74 +1,73 @@
-from pypy.module.micronumpy.iter import MultiDimViewIterator
+from pypy.module.micronumpy.iter import ArrayIterator
class MockArray(object):
size = 1
+ start = 0
class TestIterDirect(object):
- def test_C_viewiterator(self):
+ def test_iterator_basic(self):
#Let's get started, simple iteration in C order with
#contiguous layout => strides[-1] is 1
- start = 0
shape = [3, 5]
strides = [5, 1]
backstrides = [x * (y - 1) for x,y in zip(strides, shape)]
assert backstrides == [10, 4]
- i = MultiDimViewIterator(MockArray, start, strides, backstrides, shape)
+ i = ArrayIterator(MockArray, shape, strides, backstrides)
i.next()
i.next()
i.next()
assert i.offset == 3
assert not i.done()
- assert i.indexes == [0,3]
+ assert i.indices == [0,3]
#cause a dimension overflow
i.next()
i.next()
assert i.offset == 5
- assert i.indexes == [1,0]
+ assert i.indices == [1,0]
#Now what happens if the array is transposed? strides[-1] != 1
# therefore layout is non-contiguous
strides = [1, 3]
backstrides = [x * (y - 1) for x,y in zip(strides, shape)]
assert backstrides == [2, 12]
- i = MultiDimViewIterator(MockArray, start, strides, backstrides, shape)
+ i = ArrayIterator(MockArray, shape, strides, backstrides)
i.next()
i.next()
i.next()
assert i.offset == 9
assert not i.done()
- assert i.indexes == [0,3]
+ assert i.indices == [0,3]
#cause a dimension overflow
i.next()
i.next()
assert i.offset == 1
- assert i.indexes == [1,0]
+ assert i.indices == [1,0]
- def test_C_viewiterator_step(self):
+ def test_iterator_step(self):
#iteration in C order with #contiguous layout => strides[-1] is 1
#skip less than the shape
- start = 0
shape = [3, 5]
strides = [5, 1]
backstrides = [x * (y - 1) for x,y in zip(strides, shape)]
assert backstrides == [10, 4]
- i = MultiDimViewIterator(MockArray, start, strides, backstrides, shape)
+ i = ArrayIterator(MockArray, shape, strides, backstrides)
i.next_skip_x(2)
i.next_skip_x(2)
i.next_skip_x(2)
assert i.offset == 6
assert not i.done()
- assert i.indexes == [1,1]
+ assert i.indices == [1,1]
#And for some big skips
i.next_skip_x(5)
assert i.offset == 11
- assert i.indexes == [2,1]
+ assert i.indices == [2,1]
i.next_skip_x(5)
# Note: the offset does not overflow but recycles,
# this is good for broadcast
assert i.offset == 1
- assert i.indexes == [0,1]
+ assert i.indices == [0,1]
assert i.done()
#Now what happens if the array is transposed? strides[-1] != 1
@@ -76,18 +75,18 @@
strides = [1, 3]
backstrides = [x * (y - 1) for x,y in zip(strides, shape)]
assert backstrides == [2, 12]
- i = MultiDimViewIterator(MockArray, start, strides, backstrides, shape)
+ i = ArrayIterator(MockArray, shape, strides, backstrides)
i.next_skip_x(2)
i.next_skip_x(2)
i.next_skip_x(2)
assert i.offset == 4
- assert i.indexes == [1,1]
+ assert i.indices == [1,1]
assert not i.done()
i.next_skip_x(5)
assert i.offset == 5
- assert i.indexes == [2,1]
+ assert i.indices == [2,1]
assert not i.done()
i.next_skip_x(5)
- assert i.indexes == [0,1]
+ assert i.indices == [0,1]
assert i.offset == 3
assert i.done()
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