diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py index f6f188df0d6a9..2c397d0429748 100644 --- a/python/paddle/fluid/layers/nn.py +++ b/python/paddle/fluid/layers/nn.py @@ -93,6 +93,7 @@ 'mean_iou', 'relu', 'log', + 'crop', ] @@ -5003,3 +5004,101 @@ def mean_iou(input, label, num_classes): }, attrs={"num_classes": num_classes}) return out_mean_iou, out_wrong, out_correct + + +def crop(x, shape=None, offsets=None, name=None): + """ + Crop input into output, as specified by offsets and shape. + + .. code-block:: text + + * Case 1: + Given + X = [[0, 1, 2, 0, 0] + [0, 3, 4, 0, 0] + [0, 0, 0, 0, 0]], + and + shape = [2, 2], + offsets = [0, 1], + output is: + Out = [[1, 2], + [3, 4]]. + * Case 2: + Given + X = [[0, 1, 2, 5, 0] + [0, 3, 4, 6, 0] + [0, 0, 0, 0, 0]], + and shape is tensor + shape = [[0, 0, 0] + [0, 0, 0]] + and + offsets = [0, 1], + + output is: + Out = [[1, 2, 5], + [3, 4, 6]]. + + Args: + x (Variable): The input tensor variable. + shape (Variable|list/tuple of integer): The output shape is specified + by `shape`, which can a Variable or a list/tupe of integer. + If a tensor Variable, it's rank must be the same as `x`. This way + is suitable for the case that the output shape may be changed each + iteration. If a list/tupe of integer, it's length must be the same + as the rank of `x` + offsets (Variable|list/tuple of integer|None): Specifies the copping + offsets at each dimension. It can be a Variable or or a list/tupe + of integer. If a tensor Variable, it's rank must be the same as `x`. + This way is suitable for the case that the offsets may be changed + each iteration. If a list/tupe of integer, it's length must be the + same as the rank of `x`. If None, the offsets are 0 at each + dimension. + name(str|None): A name for this layer(optional). If set None, the layer + will be named automatically. + + Returns: + Variable: The cropped tensor variable. + + Raises: + ValueError: If shape is not a list, tuple or Variable. + + Examples: + + .. code-block:: python + + x = fluid.layers.data(name="x", shape=[3, 5], dtype="float32") + y = fluid.layers.data(name="y", shape=[2, 3], dtype="float32") + crop = fluid.layers.crop(x, shape=y) + + # or + z = fluid.layers.data(name="z", shape=[3, 5], dtype="float32") + crop = fluid.layers.crop(z, shape=[2, 3]) + + """ + helper = LayerHelper('crop', **locals()) + + if not (isinstance(shape, list) or isinstance(shape, tuple) or \ + isinstance(shape, Variable)): + raise ValueError("The shape should be a list, tuple or Variable.") + + if offsets is None: + offsets = [0] * len(x.shape) + + out = helper.create_tmp_variable(x.dtype) + ipts = {'X': x} + attrs = {} + if isinstance(shape, Variable): + ipts['Y'] = shape + else: + attrs['shape'] = shape + if isinstance(offsets, Variable): + ipts['Offsets'] = offsets + else: + attrs['offsets'] = offsets + + helper.append_op( + type='crop', + inputs=ipts, + outputs={'Out': out}, + attrs=None if len(attrs) == 0 else attrs) + return out diff --git a/python/paddle/fluid/tests/unittests/test_layers.py b/python/paddle/fluid/tests/unittests/test_layers.py index f8cf6f4e2d25c..82074955fae75 100644 --- a/python/paddle/fluid/tests/unittests/test_layers.py +++ b/python/paddle/fluid/tests/unittests/test_layers.py @@ -401,6 +401,15 @@ def test_maxout(self): self.assertIsNotNone(output) print(str(program)) + def test_maxout(self): + program = Program() + with program_guard(program): + x = layers.data(name='x', shape=[3, 5], dtype="float32") + y = layers.data(name='y', shape=[2, 3], dtype="float32") + output = layers.crop(x, shape=y) + self.assertIsNotNone(output) + print(str(program)) + if __name__ == '__main__': unittest.main()