How can I train my model about hncynic HOT 1 OPEN

2021-08-20 06:22:45.227694: I tensorflow_serving/core/loader_harness.cc:86] Successfully loaded servable version {name: ch_test1 version: 1555528919}
2021-08-20 06:22:45.232981: I tensorflow_serving/model_servers/server.cc:285] Running gRPC ModelServer at 0.0.0.0:9001 ...
[warn] getaddrinfo: address family for nodename not supported
2021-08-20 06:22:45.239809: I tensorflow_serving/model_servers/server.cc:301] Exporting HTTP/REST API at:localhost:9002 ...
[evhttp_server.cc : 235] RAW: Entering the event loop ...

curl --location --request POST 'http://localhost:9002/v1/models/ch_test1:predict' \
--header 'Content-Type: text/plain' \
--data-raw '{
    "title":"hello hncynic"
}'

response:
{
    "error": "Missing \'inputs\' or \'instances\' key"
}