model caching

[dcsan]

switch model trying to use caches before they're ready?

  TfManager topic blood +5m
  TfManager init TfModel +1ms
  TfManager switch topic to: blood +0ms
  TfClassifier loaded encoder 9s 509.993827ms +10s
  TfClassifier cannot find cached model /Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/data/modelCache/blood Error: Path /Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/data/modelCache/blood/model.json does not exist: loading failed
    at /Users/dc/dev/ten/puzzleparty/server/node_modules/@tensorflow/tfjs-node/dist/io/file_system.js:67:23 +5ms
  TfClassifier failed to write data /Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/data/modelCache/blood/trainingData.json +68ms
Uncaught Promise Rejection Error: ENOENT: no such file or directory, open '/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/data/modelCache/blood/trainingData.json'
    at Object.openSync (fs.js:465:3)
    at Object.writeFileSync (fs.js:1416:35)
    at TfClassifier.<anonymous> (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/src/TfClassifier.ts:123:11)
    at step (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:52:23)
    at Object.next (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:33:53)
    at /Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:27:71
    at new Promise (<anonymous>)
    at __awaiter (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:23:12)
    at TfClassifier.saveTrainingData (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:143:16)
    at TfClassifier.<anonymous> (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/src/TfClassifier.ts:188:25)
    at step (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:52:23)
    at Object.next (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:33:53)
    at /Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:27:71
    at new Promise (<anonymous>)
    at __awaiter (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/dist/TfClassifier.js:23:12)
    at TfClassifier.trainModel (/Users/dc/dev/ten/puzzleparty/server/node_modules/@dcsan/tfclassify/src/TfClassifier.ts:180:9) {