/** Shared ObjectMapper instance for JSON processing. */
    protected static final ObjectMapper objectMapper = new ObjectMapper();

    /** Buffer size reserved when truncating context to fit within max chars limit. */
    protected static final int CONTEXT_TRUNCATION_BUFFER = 100;

    /** The HTTP client used for API communication. */
    protected CloseableHttpClient httpClient;

    converted to Tensor by `tf.convert_to_tensor`.
*   Calling ops with a python constants or numpy values is now consistent with
    tf.convert_to_tensor behavior. This avoids operations like tf.reshape
    truncating inputs such as from int64 to int32.
*   Adds `tf.sparse.map_values` to apply a function to the `.value`s of
    `SparseTensor` arguments.
*   The Python bitwise operators for `Tensor` (`__and__`, `__or__`, `__xor__`