1 // Copyright (c) 2019 Intel Corporation
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
7 // http://www.apache.org/licenses/LICENSE-2.0
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10 // distributed under the License is distributed on an "AS IS" BASIS,
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12 // See the License for the specific language governing permissions and
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15 ///////////////////////////////////////////////////////////////////////////////////////////////////
22 /// @addtogroup c_api C API
24 /// @addtogroup c_topology Network Topology
26 /// @addtogroup c_primitives Primitives
33 /// @brief Broadcasts input to defined by @p broadcast_sizes output. @p broadcast_axes are used to
34 /// reinterpret input (reshape) inside algorithm.
36 /// @details Takes input, reinterpret it according to @p broadcast_axes
37 /// and copies it to output once or multiple times.
39 /// @n Simple example with empty @p broadcast_axes. Lets assume that:
40 /// @n <tt>input_sizes = (in_b, in_f, in_y, in_x)</tt>
41 /// @n <tt>broadcast_sizes = (bs_b, bs_f, bs_y, bs_x)</tt>
42 /// @n <tt>broadcast_axes = () - empty</tt>
43 /// @n The input is broadcasted on each dimension where <tt>bs_{dim} > in_{dim}</tt> and <tt>bs_{dim}</tt>
44 /// is dividable by <tt>in_{dim}</tt> (input is copied <tt>bs_{dim} / in_{dim}</tt> times).
45 /// The dimensions where <tt>bs_{dim}</tt> is equal to <tt>in_{dim}</tt> remain unchanged.
46 /// @n The resulting output will have sizes equal to @p broadcast_sizes and contains values from
47 /// input that meet following criteria:
48 /// @n <tt>output[(b, f, y, x)] = input[(b % in_b, f % in_f, y % in_y, x % in_x)]</tt>
49 /// @n where <tt>(b, f, y, x)</tt> is a position of value in a primitive output.
51 /// @n More complicated example with non empty @p broadcast_axes. Lets assume that:
52 /// @n <tt>broadcast_sizes = (bs_b, bs_f, bs_y, bs_x)</tt>
53 /// @n <tt>broadcast_axes = (2)</tt>
54 /// @n Taking into account broadcast_axes size (=1) primitive's input must be (4 - 1 = 3):
55 /// @n <tt>primitive input = (1, in_b, in_f, in_x)</tt>
56 /// @n Due to broadcast_axes = (2) primitive will interpret input as:
57 /// @n <tt>primitive input(internal representation) = (in_b, in_f, 1, in_x)</tt>
58 /// @n Now, you can apply broadcast rules from previous example to modified (reinterpreted)
60 /// @n <tt>input_sizes = (in_b, in_f, 1, in_x)</tt>
61 /// @n <tt>output_shape = (bs_b, bs_f, bs_y, bs_x)</tt>
62 /// @n <tt>broadcast_axes = () - empty</tt>
64 /// @n@b Requirements:
65 /// @n - @p broadcast_sizes must be positive on all dimensions.
66 /// @n - @p broadcast_axes size (dimensions count) must be within (inclusive) range
68 /// @n - @p broadcast_axes mustn't have duplicate values.
69 /// @n - Values of @p broadcast_axes must be within (inclusive) range 0 - 3
70 /// @n - @p output_shape must be greater (dividable) than or equal to reinterpreted
71 /// input on all dimensions.
72 /// @n Breaking any of these conditions will raise an exception.
73 CLDNN_BEGIN_PRIMITIVE_DESC(broadcast)
74 /// @brief Sizes of broadcast. Output size of current primitive will match broadcast sizes (layout type
76 cldnn_tensor broadcast_sizes;
77 /// @brief Array of axes positions from output shape (0-based, from left to right)
78 /// along which broadcast should happen.
79 cldnn_uint16_t_arr broadcast_axes;
81 CLDNN_END_PRIMITIVE_DESC(broadcast)
84 CLDNN_DECLARE_PRIMITIVE_TYPE_ID(broadcast);