Basic Backends
Overview
| Name | Initialization: Key/Type/Default | Forward Input: Key/Type | Forward Output: Key/Type | Function | Note |
|---|---|---|---|---|---|
Identity | None | data/any | result/any | dict["result"]=dict["data"] | Default backend |
Sequential | Sequential::backend | data/any | |||
Jump | jump | Jump to other (root) node | |||
Range | Range::backend;range | data/any | from v0.3.3b2 |
Backend Expansion Rule
For backend configuration, some backends have the ability to expand, for example, for backend="A[B]", it can be expanded to
backend="A"
"A::backend"="B"
Identity
Does nothing but assigns the input to the output.
Sequential
For specific examples, please refer to Sequential.
Initialization
Sequential::backend can specify multiple sub-backends separated by commas, such as Sequential::backend=A,B,C[D],E.
Sequential expands sub-backends according to the backend expansion rules to obtain:
backend="E"
backend="C"
C::backend="D"
backend="B"
backend="A"
Sub-backend initialization will be performed in reverse order.
Sequential can be composed, for example:
S[S[DecodeTensor,ResizeTensor],(or)S[DecodeMat,ResizeMat,Mat2Tensor,SyncTensor],SyncTensor].
Sub-backends of Sequential may have duplicates. If you need to specify different parameters for sub-backends, you can use the | symbol:
backend="Sequential[a,b,Jump,c,Jump]"
jump="||node_name_1||node_name_2"
# 或者，任意的占位符都是可以的：
# jump="a|b|node_name_1|c|node_name_2"
Forward
When forwarding, sub-backends are executed in series. If the result of a non-final sub-backend is empty, the execution is terminated and an exception is thrown. If the result of a non-final sub-backend is non-empty, the filter will be executed. The default is swap.
Input Range
If the input data range of all sub-backends is [1,1], then the range of Sequential is [1,1]. Otherwise, it is the union of the input ranges of sub-backends whose input ranges are not [1,1]. Currently, only one sub-backend is allowed to satisfy max() != 1 && max() != UINT32_MAX at most. In Sequential, currently only one sub-backend with non-trivial input range is allowed at most, and this sub-backend can be regarded as the main functional implementer of the entire Sequential, while other backends are auxiliary or functional backends.
Range
Set a new maximum and minimum range [target_min, target_max].
Use dynamic programming to determine whether all the integer 'target' in [target_min, target_max] can be represented as the sum
of multiple numbers within Range::backend's [min, max] range, and provide a result with the largest possible values.
Initialization
- range - Target [min, max]. for example,
range="1,10". - Range::backend - Proxy backend.
Initialization fails if the new range cannot be represented by the range in the old range. For example, target=10, [min, max]=[2,9] => 10 = 8+2. And the following situations will fail: range=[10,10], [min, max]=[8,8] => 10 != 8.