I am asking you a question because a SyntaxError occurred while coding related to KNN... How can I solve this problem?

def compute_distance(self, X_test, dist_metric='dot'):

```
if dist_metric=='dot':
sim = np.matmul(X_test, self.X_train.T)
dists = -sim
elif dist_metric=='l2':
n_test = X_test.shape[0]
#SyntaxError: invalid character in identifier occurs here, but I'm not sure why the error occurs. (n_test = X_test.shape[0])
n_train = self.X_train.shape[0]
dists = np.sqrt(np.tile(np.sum(np.square(self.X_train), axis=1), (n_test, 1)) + np.tile(np.sum(np.square(X_test), axis=1), (n_train, 1)).T - 2 * np.matmul(X_test, self.X_trai.T)
else:
raise KeyError("Distance metrics currently supported: \'l2\' and \'dot\'")
return dists
```

2022-09-20 08:57

I tried copying and pasting the source code of the question into the vcode

An invisible blank character was immediately preceded by n_test.

2022-09-20 08:57

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