Source code for mars.tensor.arithmetic.subtract

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 1999-2021 Alibaba Group Holding Ltd.
#
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
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# Unless required by applicable law or agreed to in writing, software
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# See the License for the specific language governing permissions and

import numpy as np

from ... import opcodes as OperandDef
from ..utils import infer_dtype
from .core import TensorBinOp
from .utils import arithmetic_operand

@arithmetic_operand(sparse_mode="binary_and")
class TensorSubtract(TensorBinOp):
_op_type_ = OperandDef.SUB
_func_name = "subtract"

[docs]@infer_dtype(np.subtract) def subtract(x1, x2, out=None, where=None, **kwargs): """ Subtract arguments, element-wise. Parameters ---------- x1, x2 : array_like The tensors to be subtracted from each other. out : Tensor, None, or tuple of Tensor and None, optional A location into which the result is stored. If provided, it must have a shape that the inputs broadcast to. If not provided or `None`, a freshly-allocated tensor is returned. A tuple (possible only as a keyword argument) must have length equal to the number of outputs. where : array_like, optional Values of True indicate to calculate the ufunc at that position, values of False indicate to leave the value in the output alone. **kwargs Returns ------- y : Tensor The difference of `x1` and `x2`, element-wise. Returns a scalar if both `x1` and `x2` are scalars. Notes ----- Equivalent to ``x1 - x2`` in terms of tensor broadcasting. Examples -------- >>> import mars.tensor as mt >>> mt.subtract(1.0, 4.0).execute() -3.0 >>> x1 = mt.arange(9.0).reshape((3, 3)) >>> x2 = mt.arange(3.0) >>> mt.subtract(x1, x2).execute() array([[ 0., 0., 0.], [ 3., 3., 3.], [ 6., 6., 6.]]) """ op = TensorSubtract(**kwargs) return op(x1, x2, out=out, where=where)
@infer_dtype(np.subtract, reverse=True) def rsubtract(x1, x2, **kwargs): op = TensorSubtract(**kwargs) return op.rcall(x1, x2)