why streaming is not supported for titan and cohere model on bedrock

Question

Here is my code that enable streaming tokens, it works for LLaMa-2 but not for titan, cohere. Are these model not support streaming yet?

```

accept = '*/*'
contentType = 'application/json'
response = brt.invoke_model_with_response_stream(
    modelId='amazon.titan-text-express-v1', 
    body=body,
    accept=accept, 
    contentType=contentType
)

stream = response.get('body')
if stream:
    for event in stream:
        chunk = event.get('chunk')
        if chunk:
            print(json.loads(chunk.get('bytes').decode()))
```

Answer

Cohere models support streaming, but you need to pass the `"stream" : true` parameter in the JSON body to enable streaming, in addition to using the `invoke_model_with_response_stream` API.

You can try the following code:

```
body = json.dumps({
                "prompt": prompt,
                "max_tokens": max_token_count,
                "temperature": temperature,
                "p": top_p,
                "stop_sequences": stop_sequences,
                "stream": True,
            })

response = brt.invoke_model_with_response_stream(
    modelId='cohere.command-text-v14', 
    body=body,
    accept=accept, 
    contentType=contentType
)

stream = response.get('body')
if stream:
    for event in stream:
        chunk = event.get('chunk')
        if chunk:
            print(json.loads(chunk.get('bytes').decode()))
```

why streaming is not supported for titan and cohere model on bedrock

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