How to get image classification prediction from GCP AIPlatform in ruby? - ruby

Question

I'm new with ruby and I want to use GCP AIPlatform but I'm struggeling with the payload.
So far, I have :
client = ::Google::Cloud::AIPlatform::V1::PredictionService::Client.new do |config|
config.endpoint = "#{location}-aiplatform.googleapis.com"
end
img = File.open(imgPath, 'rb') do |img|
'data:image/png;base64,' + Base64.strict_encode64(img.read)
end
instance = Instance.new(:content => img)
request = Google::Cloud::AIPlatform::V1::PredictRequest.new(
endpoint: "projects/#{project}/locations/#{location}/endpoints/#{endpoint}",
instances: [instance]
)
result = client.predict request
p result
Here is my proto
message Instance {
required bytes content = 1;
};
But I have the following error : Invalid type Instance to assign to submessage field 'instances'
I read the documentation but for ruby SDK it's a bit light.
The parameters are OK, the JS example here : https://github.com/googleapis/nodejs-ai-platform/blob/main/samples/predict-image-object-detection.js is working with those parameters
What am I doing wrong ?

Answer 1

I managed it
client = Google::Cloud::AIPlatform::V1::PredictionService::Client.new do |config|
config.endpoint = "#{location}-aiplatform.googleapis.com"
end
img = File.open(imgPath, 'rb') do |img|
Base64.strict_encode64(img.read)
end
instance = Google::Protobuf::Value.new(:struct_value => {:fields => {
:content => {:string_value => img}
}})
endpoint = "projects/#{project}/locations/#{location}/endpoints/#{endpoint}"
request = Google::Cloud::AIPlatform::V1::PredictRequest.new(
endpoint: endpoint,
instances: [instance]
)
result = client.predict request
p result
The use of the Google::Protobuf::Value looks ugly to me but it works