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langgraph: support subgraphs with a single node (#3780)

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This commit is contained in:
Vadym Barda
2025-03-12 00:09:35 +00:00
committed by GitHub
parent 84c956bc8c
commit 02a46c45c8
5 changed files with 57 additions and 55 deletions
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libs/langgraph/langgraph/graph/graph.py
+1 -1
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@@ -472,7 +472,7 @@ class CompiledGraph(Pregel):
)
subgraph.trim_first_node()
subgraph.trim_last_node()
if len(subgraph.nodes) > 1:
if len(subgraph.nodes) >= 1:
e, s = graph.extend(subgraph, prefix=key)
if e is None:
raise ValueError(
libs/langgraph/poetry.lock
Generated
+9 -9
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@@ -1324,19 +1324,19 @@ files = [
[[package]]
name = "langchain-core"
version = "0.3.30"
version = "0.3.44"
description = "Building applications with LLMs through composability"
optional = false
python-versions = "<4.0,>=3.9"
groups = ["main", "dev"]
files = [
{file = "langchain_core-0.3.30-py3-none-any.whl", hash = "sha256:0a4c4e02fac5968b67fbb0142c00c2b976c97e45fce62c7ac9eb1636a6926493"},
{file = "langchain_core-0.3.30.tar.gz", hash = "sha256:0f1281b4416977df43baf366633ad18e96c5dcaaeae6fcb8a799f9889c853243"},
{file = "langchain_core-0.3.44-py3-none-any.whl", hash = "sha256:d989ce8bd62f1d07765acd575e6ec1254aec0cf7775aaea39fe4af8102377459"},
{file = "langchain_core-0.3.44.tar.gz", hash = "sha256:7c0a01e78360f007cbca448178fe7e032404068e6431dbe8ce905f84febbdfa5"},
]
[package.dependencies]
jsonpatch = ">=1.33,<2.0"
langsmith = ">=0.1.125,<0.3"
langsmith = ">=0.1.125,<0.4"
packaging = ">=23.2,<25"
pydantic = [
{version = ">=2.5.2,<3.0.0", markers = "python_full_version < \"3.12.4\""},
@@ -1348,7 +1348,7 @@ typing-extensions = ">=4.7"
[[package]]
name = "langgraph-checkpoint"
version = "2.0.16"
version = "2.0.18"
description = "Library with base interfaces for LangGraph checkpoint savers."
optional = false
python-versions = "^3.9.0,<4.0"
@@ -1366,7 +1366,7 @@ url = "../checkpoint"
[[package]]
name = "langgraph-checkpoint-postgres"
version = "2.0.15"
version = "2.0.16"
description = "Library with a Postgres implementation of LangGraph checkpoint saver."
optional = false
python-versions = "^3.9.0,<4.0"
@@ -1386,7 +1386,7 @@ url = "../checkpoint-postgres"
[[package]]
name = "langgraph-checkpoint-sqlite"
version = "2.0.5"
version = "2.0.6"
description = "Library with a SQLite implementation of LangGraph checkpoint saver."
optional = false
python-versions = "^3.9.0"
@@ -1404,7 +1404,7 @@ url = "../checkpoint-sqlite"
[[package]]
name = "langgraph-prebuilt"
version = "0.1.1"
version = "0.1.2"
description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
optional = false
python-versions = "^3.9.0,<4.0"
@@ -1422,7 +1422,7 @@ url = "../prebuilt"
[[package]]
name = "langgraph-sdk"
version = "0.1.53"
version = "0.1.55"
description = "SDK for interacting with LangGraph API"
optional = false
python-versions = "^3.9.0,<4.0"
libs/langgraph/tests/__snapshots__/test_large_cases.ambr
+12 -12
View File
@@ -3116,8 +3116,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3126,6 +3124,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -3141,8 +3141,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3151,6 +3149,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -3166,8 +3166,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3176,6 +3174,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -3191,8 +3191,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3201,6 +3199,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -3216,8 +3216,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3226,6 +3224,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -3241,8 +3241,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -3251,6 +3249,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
libs/langgraph/tests/__snapshots__/test_large_cases_async.ambr
+12 -12
View File
@@ -6,8 +6,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -16,6 +14,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -31,8 +31,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -41,6 +39,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -56,8 +56,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -66,6 +64,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -81,8 +81,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -91,6 +89,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -106,8 +106,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -116,6 +114,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
@@ -131,8 +131,6 @@
__start__([<p>__start__</p>]):::first
router_node(router_node)
normal_llm_node(normal_llm_node)
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
__end__([<p>__end__</p>]):::last
__start__ --> router_node;
normal_llm_node --> __end__;
@@ -141,6 +139,8 @@
router_node -.-> weather_graph_model_node;
router_node -.-> __end__;
subgraph weather_graph
weather_graph_model_node(model_node)
weather_graph_weather_node(weather_node<hr/><small><em>__interrupt = before</em></small>)
weather_graph_model_node --> weather_graph_weather_node;
end
classDef default fill:#f2f0ff,line-height:1.2
libs/langgraph/tests/__snapshots__/test_pregel.ambr
+23 -21
View File
@@ -1722,13 +1722,13 @@
__start__([<p>__start__</p>]):::first
uno(uno)
dos(dos)
subgraph_one(one)
subgraph_two(two)
subgraph_three(three)
__start__ --> uno;
uno -.-> dos;
uno -.-> subgraph_one;
subgraph subgraph
subgraph_one(one)
subgraph_two(two)
subgraph_three(three)
subgraph_one -.-> subgraph_two;
subgraph_one -.-> subgraph_three;
end
@@ -1752,12 +1752,14 @@
%%{init: {'flowchart': {'curve': 'linear'}}}%%
graph TD;
__start__([<p>__start__</p>]):::first
inner(inner)
side(side)
__end__([<p>__end__</p>]):::last
__start__ --> inner;
inner --> side;
__start__ --> inner_up;
inner_up --> side;
side --> __end__;
subgraph inner
inner_up(up)
end
classDef default fill:#f2f0ff,line-height:1.2
classDef first fill-opacity:0
classDef last fill:#bfb6fc
@@ -1895,10 +1897,6 @@
graph TD;
__start__([<p>__start__</p>]):::first
tool_one(tool_one)
tool_two___start__(<p>__start__</p>)
tool_two_tool_two_slow(tool_two_slow)
tool_two_tool_two_fast(tool_two_fast)
tool_two___end__(<p>__end__</p>)
tool_three(tool_three)
__end__([<p>__end__</p>]):::last
__start__ -.-> tool_one;
@@ -1908,6 +1906,10 @@
__start__ -.-> tool_three;
tool_three --> __end__;
subgraph tool_two
tool_two___start__(<p>__start__</p>)
tool_two_tool_two_slow(tool_two_slow)
tool_two_tool_two_fast(tool_two_fast)
tool_two___end__(<p>__end__</p>)
tool_two___start__ -.-> tool_two_tool_two_slow;
tool_two_tool_two_slow --> tool_two___end__;
tool_two___start__ -.-> tool_two_tool_two_fast;
@@ -1962,24 +1964,24 @@
graph TD;
__start__([<p>__start__</p>]):::first
gp_one(gp_one)
gp_two___start__(<p>__start__</p>)
gp_two_p_one(p_one)
gp_two_p_two___start__(<p>__start__</p>)
gp_two_p_two_c_one(c_one)
gp_two_p_two_c_two(c_two)
gp_two_p_two___end__(<p>__end__</p>)
gp_two___end__(<p>__end__</p>)
__end__([<p>__end__</p>]):::last
__start__ --> gp_one;
gp_two___end__ --> gp_one;
gp_one -. &nbsp;0&nbsp; .-> gp_two___start__;
gp_one -. &nbsp;1&nbsp; .-> __end__;
subgraph gp_two
gp_two___start__(<p>__start__</p>)
gp_two_p_one(p_one)
gp_two___end__(<p>__end__</p>)
gp_two___start__ --> gp_two_p_one;
gp_two_p_two___end__ --> gp_two_p_one;
gp_two_p_one -. &nbsp;0&nbsp; .-> gp_two_p_two___start__;
gp_two_p_one -. &nbsp;1&nbsp; .-> gp_two___end__;
subgraph p_two
gp_two_p_two___start__(<p>__start__</p>)
gp_two_p_two_c_one(c_one)
gp_two_p_two_c_two(c_two)
gp_two_p_two___end__(<p>__end__</p>)
gp_two_p_two___start__ --> gp_two_p_two_c_one;
gp_two_p_two_c_two --> gp_two_p_two_c_one;
gp_two_p_two_c_one -. &nbsp;0&nbsp; .-> gp_two_p_two_c_two;
@@ -1998,16 +2000,16 @@
graph TD;
__start__([<p>__start__</p>]):::first
p_one(p_one)
p_two___start__(<p>__start__</p>)
p_two_c_one(c_one)
p_two_c_two(c_two)
p_two___end__(<p>__end__</p>)
__end__([<p>__end__</p>]):::last
__start__ --> p_one;
p_two___end__ --> p_one;
p_one -. &nbsp;0&nbsp; .-> p_two___start__;
p_one -. &nbsp;1&nbsp; .-> __end__;
subgraph p_two
p_two___start__(<p>__start__</p>)
p_two_c_one(c_one)
p_two_c_two(c_two)
p_two___end__(<p>__end__</p>)
p_two___start__ --> p_two_c_one;
p_two_c_two --> p_two_c_one;
p_two_c_one -. &nbsp;0&nbsp; .-> p_two_c_two;