RuntimeError: mat1 and mat2 shapes cannot be multiplied (5x100352 and 2048x512)

时间: 2024-01-22 13:57:56 浏览: 121

RuntimeError: Cannot run the event loop while another loop is running(目前没有解决)

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代码如下: import tornado.ioloop import tornado.web from tornado.httpclient import HTTPClient, AsyncHTTPClient class MainHandler(tornado.web.RequestHandler): # 同步 def get(self): h_c = HTTPClient() res = h_c.fetch("http://www.baidu.com") # print(res) # pass 在Python的Tornado框架中，`RuntimeError: Cannot run the event loop while another loop is running` 是一个常见的错误，它表明你的代码试图在一个已经运行中的事件循环（Event Loop）内启动另一个事件循环。这个错误通常发生在你尝试并发地执行同步和异步操作时，特别是当你在异步处理程序中使用了非异步的HTTP客户端时。让我们来看看问题的代码段： ```python import tornado.ioloop import tornado.web from tornado.httpclient import HTTPClient, AsyncHTTPClient class MainHandler(tornado.web.RequestHandler): def get(self): h_c = HTTPClient() res = h_c.fetch("http://www.baidu.com") # self.write("Hello, world") class TestHandler(tornado.web.RequestHandler): async def get(self): http_client = AsyncHTTPClient() try: res = await http_client.fetch("http://www.baidu.com") except Exception as e: print("Error: %s" % e) else: pass self.write("Hello, world1") def make_app(): return tornado.web.Application([ (r"/test", TestHandler), (r"/", MainHandler), ]) if __name__ == "__main__": app = make_app() app.listen(8888) tornado.ioloop.IOLoop.current().start() ``` 在这段代码中，`MainHandler` 类的 `get` 方法使用了同步的 `HTTPClient` 来发起请求。而 `TestHandler` 类的 `get` 方法则是异步的，它使用了 `AsyncHTTPClient`。问题出在同步的 `HTTPClient` 上，因为它内部依赖于事件循环，而这个事件循环可能已经在运行中，导致了冲突。 Tornado的事件循环是单线程的，这意味着在同一时间只能有一个事件循环在运行。当你尝试在一个已经运行的事件循环中启动另一个事件循环时，Tornado会抛出上述的 `RuntimeError`。为了解决这个问题，你需要确保所有在事件循环内的操作都是异步的。在 `MainHandler` 中，你可以将 `HTTPClient` 替换为 `AsyncHTTPClient` 并使用 `await` 关键字来等待响应。这样，请求将会被添加到当前事件循环的任务队列中，而不是尝试启动一个新的事件循环： ```python class MainHandler(tornado.web.RequestHandler): async def get(self): http_client = AsyncHTTPClient() try: res = await http_client.fetch("http://www.baidu.com") except Exception as e: print("Error: %s" % e) else: pass self.write("Hello, world") ``` 同时，确保你的环境支持异步操作，例如，Python 3.5 及以上版本支持 `async` 和 `await` 关键字。此外，如果你的代码需要处理多个并发请求，可以考虑使用 `concurrent.futures` 模块或者 Tornado 的 `gen.coroutine` 装饰器来实现并发，而不是直接启动新的事件循环。总结来说，解决 `RuntimeError: Cannot run the event loop while another loop is running` 错误的关键在于保持事件循环的一致性，确保所有的操作都在同一个事件循环内进行，避免在异步环境中使用同步代码。通过使用异步客户端和 `await` 关键字，你可以确保代码与Tornado的事件驱动模型兼容。

This error occurs when attempting to multiply two matrices with incompatible dimensions. Specifically, the number of columns in the first matrix (mat1) must match the number of rows in the second matrix (mat2). In this case, mat1 is a matrix with 5 rows and 100352 columns, while mat2 is a matrix with 2048 rows and 512 columns. Since the number of columns in mat1 does not match the number of rows in mat2, they cannot be multiplied together. To fix this error, either reshape the matrices so that their dimensions are compatible for multiplication, or use a different operation that is valid for the given dimensions.

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RuntimeError: mat1 and mat2 shapes cannot be multiplied (5x100352 and 2048x512)

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