Links between multiple nodes

Serial Nodes

The Sequential[DecodeMat,ResizeMat] backend can be represented in a multi-node manner as follows:

# irrelevant parameters are ignored 
[decode]
# highlight-next-line
next="resize"

[resize]

The decode->resize forms a directed acyclic graph consisting of two nodes, where decode is the root node and resize is the child node.

Multiple Branches

If a node has multiple subsequent nodes, they can be separated by commas in the next field.

Consider the following multi-node system:

flowchart TD
    A --> B
    A --> C
    C --> D[output]
    B --> D

The node relationship can be represented as:

# irrelevant parameters are ignored 
[A]
# highlight-next-line
next="B,C"
[B]
next="output"
[C]
next="output"
[output]

Data Flow

The original input dict data is processed by node A, and both nodes B and C request data from node A. To avoid accessing modified data, both nodes B and C make a copy of the data from node A.

map: Collecting Data from Preceding Nodes

# irrelevant parameters are ignored 
[output]
# highlight-next-line
map="B[result:B_result],C[result:data]"

map can also map multiple key-value pairs from preceding nodes to itself, such as map="B[1:0,1:1,2:data]".

If there is no ambiguity, the node name can be omitted in map, such as map="[result:data]".

Note:

• The combined data must include data.
• Like next, map also creates a reference to the source node. If a node is referenced by two or more subsequent nodes, its data will be copied when requested by the subsequent nodes.
• When requesting data through map, the source data is always copied.